Slide guitar is a particular method or technique for playing the guitar. The term slide refers to the motion of the slide along the strings. Instead of altering the pitch of the strings in the normal manner (by pressing the string against frets), a slide is placed upon the string to vary its vibrating length, and pitch. This slide can then be moved along the string without lifting, creating continuous transitions in pitch.
Slide guitar is most often played (assuming a right-handed player and guitar):
- With the guitar in the normal position, using a slide on one of the fingers of the left hand.
- With the guitar held horizontally, with the belly uppermost and the bass strings toward the player, and using a slide called a "steel" held in the left hand; this is known as "lap steel guitar".
The technique was made popular by African American blues artists. The first musician to be recorded using the style was Sylvester Weaver who recorded two solo pieces "Guitar Blues" and "Guitar Rag" in 1923. Some of the blues artists who most prominently used the slide include gospel singer Blind Willie Johnson, Blind Willie McTell, Mississippi Fred McDowell, Son House, Robert Johnson as well as Casey Bill Weldon of the Memphis Jug Band. The sound has since become commonplace in country and Hawaiian music. (Music for a Hawaiian guitar includes a beatiful composition "Maria Elena"). It is also used in rock, by bands and artists such as The Doors, Canned Heat, The Allman Brothers Band, Led Zeppelin, Ry Cooder, Chris Rea, Bonnie Raitt, Lynyrd Skynyrd, Little Feat, Eagles, ZZ Top, Whitesnake, AC/DC and Metallica. The Rolling Stones featured a slide guitar as early as their 1963 recording of the John Lennon/Paul McCartney song "I Wanna Be Your Man". Guitarist Brian Jones played slide in a very blues-oriented style. His successor Mick Taylor also displayed his own slide guitar skills while with the band. Rolling Stones vocalist Mick Jagger has also played slide guitar on occasion (both in the Stones and his solo career). Many early Pink Floyd songs such as "See Emily Play" feature Syd Barrett's slide guitar performances, reflecting the band's original Chicago urban blues repertoire from musicians such as Bo Diddley and Slim Harpo. Canned Heat's Alan Wilson also helped bring slide guitar to the rock music industry in the late 1960s which he used frequently during concerts to create a buzzing delta blues boogie which can be heard on tracks such as London Blues, I Love My Baby, Sandy Blues, and countless others and can also be seen during their performances at the Monterey Pop Festival on Rollin and Tumblin' and at Woodstock During Woodstock Boogie and On The Road Again. George Harrison experimented with slide guitar during the latter half of The Beatles' career, first using the technique on an early outtake recording of "Strawberry Fields Forever" in 1966. He later used slide extensively during his solo career on songs such as "My Sweet Lord", "Cheer Down" and the Traveling Wilburys' as well as on The Beatles' 1995 reunion single "Free as a Bird".
Arguably the first influential classic electric blues slide guitarist is Elmore James, whose riff in the song "Dust My Broom" is copied from Robert Johnson and is held in particularly high regard. Blues legend Muddy Waters was also very influential, particularly in developing the electric Chicago blues slide guitar from the acoustic Mississippi Delta slide guitar. Texas blues musician Johnny Winter developed his distinctive style through years of touring with Waters. Slide player Roy Rogers honed his slide skills by touring with blues artist John Lee Hooker. John Lee's cousin Earl Hooker may have been the first to use wah-wah and slide together.
Like Alan Wilson, Duane Allman played a key role in bringing slide guitar into rock music, through his work with The Allman Brothers Band, specifically on the 1971 live album At Fillmore East and with Derek and the Dominos' Layla and Other Assorted Love Songs album. Other slide guitarists such as Bonnie Raitt, Rory Gallagher, Gary Rossington of Lynyrd Skynyrd, and Joe Walsh used middle finger and later in the mid 80s, used a brass slide.
Allman extended the expressive range of the slide guitar by incorporating the harmonica effects of Sonny Boy Williamson II, most clearly in the Allman Brothers' cover version of Sonny Boy's "One Way Out", heard on their album Eat a Peach. His playing on the original studio recording of "Layla" imparted a sublime quality for which the song is distinctly memorable.
Most recently lap style slide has been reborn via artists like Jack White, Sean Kirkwood and Xavier Rudd - both players of weissenborns, the former using original early 1900s instruments long with modern day variations such as his own co-designed Asher signature model, the latter using modern reproductions of weissenborn.
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Slides may be used on any guitar, but slides generally and steels in particular are often used on instruments specifically made to be played in this manner. These include:
- All steel guitars.
- Many (perhaps most) resonator guitars, particularly Dobros and their descendants.
- Lap slide guitars, particularly Weissenborns and their descendants.
- Conventional electric guitar.
An ordinary guitar, either electric or acoustic, can be used for playing slide. Often the strings are raised a little higher off the fingerboard than they would be for ordinary guitar playing. This is done especially if the free fingers are not going to be used for fretting. An extension nut may be used to achieve the higher string height at the peghead end of the fingerboard. This is just a normal nut, with the slots filed less deeply, and often in a straight line rather than following the radius of the fretboard.
The lap steel and the pedal steel are guitars that have evolved especially for playing slide in the horizontal position. Resophonic or resonator guitars have often been employed for slide playing, typically held horizontally. They are sometimes known as Dobros after the Dopyera brothers, whose company first made them. National is another brand. In resonator guitars, rather than the sound being produced by the body's hollow, a special bridge transfers the vibrations from the strings to a metal cone placed inside the body.
A slide can be made with any type of smooth hard material that allows tones to resonate. The slide's weight (in terms of density and wall thickness) cause differences in sustain, timbre, and loudness, while the surface structure and material affect tonal clarity and timbre.
In 1989, Terrie Lambert invented the Moonshine (ceramic) slide that produces a timbre in between that of brass and glass, and the Mudslide (porcelain) slide, which just as brass slides is quite heavy, producing richer, fuller and resonating tones with more harmonics. As a result, they are often used in blues music. The Moonshine and Mudslide slides are glazed on the outside but porous on the inside so that finger moisture is absorbed, preventing slippage. Metals such as stainless steel, chrome and aluminium cause a bright penetrating sound and are mostly used with electric guitars, among others for rock music. Segments of PVC piping can be used to achieve a slide, and is common among those who do not choose to buy a slide.
Square, beveled or rounded edges may allow a player to apply different techniques, while tapered rather than straight sides may help improve control and cause less damping. Pedal steel players may prefer using tonebars, which have one capped end. One recent development is the rise of hybrid slides. Glass Moonshine slides are made of glass, but have a porous ceramic interior that helps prevent slipping; other slides have been designed to reduce the weight of brass or porcelain slides by using a lightweight interior, while still others are made of glass on the front and of metal on the back to allow easy switching.
One can use a solid metal bar or rod, laid across the strings of the guitar and held by the fingers of the fretting hand being laid on it to either side, parallel to it. Pipes, and stones have also been used to good effect, as have rings and spoons. Even a knife can reportedly be used:
- "As he played, he pressed a knife on the strings of the guitar in a manner popularised by Hawaiian guitarists who used steel bars. The effect was unforgettable." ―W. C. Handy on his first hearing slide guitar, a blues player in the Tutwiler, Mississippi train station.
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The slide is pressed against the strings—lightly, so as not to touch the strings to the fretboard, and parallel to the frets. The pitch of the strings can then be continuously varied by moving the slide up and down the fingerboard. The usual limitation in fretted guitar playing of twelve pitches per octave does not apply. The technique lends itself to glissandi (swoops up or down to a note); in addition it has the ability to evoke sounds of the human voice or natural noises. Another strength of the technique is its vibrato, which is easily achieved by oscillating the hand so that the slide goes quickly back and forth.
The major limitation of slide playing is of course that only one chord shape is available: whatever the strings happen to be tuned to going straight across. Many slide guitarists will still use their free fingers to fret the strings if they want to employ that sound as well. Using the free fingers opens up the possibility of playing chord shapes other than the straight line given by the slide. One strategy is to use the free fingers for rhythm work, and intersperse this with lead phrases played with the slide.
The guitar may be held in the normal guitar-playing position (that is, with the face of the guitar more-or-less vertical) or it may be held flat, with the face of the guitar horizontal. In the latter case the guitar may sit flat in one's lap or on a stool, face up, or held in this position by a strap, and played standing up. If holding the guitar in the normal vertical position, it is more common to use the tube type of slide. In the horizontal approach, solid bars are more commonly used, and the grip is overhand: the hand is not wrapped around the slide, the index finger is nearest the bridge, the little finger nearest the nut, fingers pointing away from the chest.
Usually, a slide player will use open tuning, although standard tuning is sometimes used. In open tuning the strings are tuned to sound a chord when not fretted. The chord tuned to is most often major. Open tunings commonly used with slide include Open D or "Vestapol" tuning: D-A-d-f#-a-d; and Open G or "Spanish" tuning: D-G-d-g-b-d . Open E and Open A, formed by raising each of those tunings a whole tone, are also common. These tunings can be traced back to the 19th century through the banjo, predating the Hawaiian guitar. Other tunings are used as well.
Slide guitar is most often fingerpicked, with or without plastic or metal picks on the thumb and fingers. However some players use a flatpick (plectrum).
The bottleneck or tube type of slide is usually worn over the ring (3rd) or little (4th) finger. Wearing it on the 4th finger has the advantage of leaving one more finger free to fret notes if desired. However some players feel that they get better control using the ring finger. Most instructors recommend letting one or more of the fingers behind the slide rest lightly on the strings to help mute unwanted vibrations.
Double slide guitar system 
A relatively new technique, expanding the musical range and sonic capabilities of slide guitar, is the system of double slide guitar. It was invented by Brian Cober,[non-primary source needed] a Canadian blues musician. In double slide, the first slide is placed on the middle finger (usually a modified steel bar that can be put on the finger), and a modified thumb slide is put on the thumb that is able to cover two strings. Double slide is meant to be played on a six-string lap guitar (or a regular six-string guitar modified with the strings raised for high action like a lap guitar), usually tuned to open E tuning. The double slide guitar system enables the player to play chords not heard in open tunings, such as minor chords, dominant seventh chords, etc. and provides a greater use of technique in soloing. Will Ray of the Hellecasters uses a similar technique, wearing "stealth" pinky-type slides on either hand.
In recent years, some guitarists have developed the bottleneck technique further by introducing other guitar effects.
A few musicians have used slides with bass guitar: slide bass. Mark Sandman was probably the best known proponent (with Morphine, he performed primarily on a custom two-string slide bass guitar). Bill Laswell, Robert Weaver[disambiguation needed], Kevin Rutmanis, Marc Sloan, and Stefan Lessard have also played slide bass. John Paul Jones of Led Zeppelin has performed on a custom-made bass lap steel. Timo Shanko of G. Love & Special Sauce, incorporates slide playing on electric bass. Jazz bassist Victor Wooten occasionally uses a slide for soloing during his live performances. Similarly to Jones, Mark Robbins, bass player and song writer from Joan, plays a number of songs in the standing lap slide style.
29 second sample of the song
27 second sample of the song
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The following samples give an impression of the various styles of slide guitar. First is Robert Johnson's "Traveling Riverside Blues", one of the best-known examples of Delta blues slide guitar. Second, a part of Duane Allman's solo from Derek and the Dominos's "Layla" is included, to give an impression of highly acclaimed slide work in rock music.
See also 
- Blues guitar playing
- Classical guitar
- Electric guitar
- Lap steel guitar
- List of slide guitarists
- Pedal steel guitar
- Vichitra veena
- Chitra veena
- Payne, Rick. "History and Origin of the Slide Guitar in the Blues". Lessons. Guitar Noise. Retrieved 3 March 2010.
- (van der Merwe 1989, pp. 66–67)
- Mick Jagger Playing Slide Guitar http://www.youtube.com/watch?v=mBeXS-mru5Q
- Oliver, Paul (1984). Blues Off the Record. New York, N.Y.: Da Capo Press. p. 109. ISBN 0-306-80321-6.
- Brian Cober, "Home Page"
- Jonathan St. Rose "Brian Cober, blues guitarist"
- van der Merwe, Peter (1989), Origins of the Popular Style: The Antecedents of Twentieth-Century Popular Music, Oxford: Clarendon Press, pp. 66–67, ISBN 0-19-316121-4
- The Magic and Mystery of Slide Guitar - an exhibit curated by the Museum of Making Music, National Association of Music Merchants, Carlsbad, CA – detailing the history and evolution of slide guitar technique.
- Slide Guitar for Beginners
- What are the best guitar slides?
- Open-G tuning, Open-E tuning and Slide guitar An overview of Open-G and Open-E slide
- Griff Hamlin Blues Guitar