Open D tuning
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Open D tuning is an open tuning for the acoustic or electric guitar. The open string notes in this tuning are (from lowest to highest): D A D F♯ A D. It uses the three notes that form the triad of a D major chord: D, the root note; A, the perfect fifth; and F♯, the major third. 
To tune a guitar from standard tuning to Open D tuning: Lower the 1st (high-E), 2nd (B), and 6th (low-E) down a full step. Lower the 3rd string (G) down half a step to F♯.
In this tuning, when the guitar is strummed without fretting any of the strings, a D major chord is sounded. This means that any major chord can be easily created using one finger, fretting all the strings at once (also known as barring); for example, fretting all the strings at the second fret will produce an E major, at the third fret an F major, and so on up the neck.
Open D tuning is very popular with slide guitar (or 'bottleneck') players, as it allows them to play complete chords using the slide. This tuning is also used in regular (non-slide) guitar playing. The full and vibrant sound it produces - particularly on an acoustic guitar - also makes it ideal for fingerstyle playing.
Many new chord shapes and sounds are available with open D tuning. It can offer a strong compositional element that produces tonal qualities markedly different from standard tuning. The full range of major and minor chords, with all their extensions, are available to the player. Many well-known guitarists have used this tuning at some point in their career. For example, Bob Dylan's album Blood on the Tracks was first recorded entirely in open D tuning. Neil Young, Richie Havens, Joni Mitchell, Bruce Cockburn, Barry Gibb, Jim O'Rourke and Jason Swain have all released recordings featuring this tuning as well. Elmore James used this tuning heavily. Stone Gossard from Pearl Jam uses this tuning when playing the rhythm guitar on "Even Flow" and "Oceans", from their Ten album. Mumford & Sons also uses this tuning on their tracks "The Cave", "Awake My Soul" and "Roll Away Your Stone" from their album Sigh No More. Needtobreathe used it on some of their songs, most notably "Something Beautiful" from The Outsiders. Laura Marling uses the tuning on the title track of her 2010 album, I Speak Because I Can. Kevin Shields of My bloody Valentine uses this tuning on many songs. Also Alessio Frusta uses this tuning on the track "Freedom Island" from his 2015 album "Pen Siero"
D-A-D-F♯-A-C♯, Open Dmaj7 tuning
This variant is achieved lowering the high D string a half step to C♯ when tuned to open D. C♯ is the major seventh of the D major scale, hence the name. It also can be used for both fingerstyle and slide guitar work.
D-A-D-F-A-D, Open Dm tuning
This variant uses an F natural, the minor third.
Red Label Catharsis performs and records entirely in this tuning. More recently, this tuning has been used by Niko Wenner of Oxbow on the songs "Angel," "Cat and Mouse"; by Ian Thornley of Big Wreck on "Ladylike" and "Overemphasizing" and by Owen Campbell on "Sunshine Road".
D-A-D-F-A-E, Open Dmadd9 tuning
This variant, called the "Open D5 tuning", is used by Mark Tremonti of Alter Bridge and Creed. Six of the songs in which it is used are "Are You Ready?", "Faceless Man", "My Sacrifice", Fortress, "Ghost of Days Gone By" (half-step down), and "Open Your Eyes" as well as "Rain", "Brains", and "New Way Out" all tuned down 1 and a half steps (BF♯BF♯BB). This tuning is also used in the Alter Bridge song 'Life Must Go On'. Mark has mentioned in his instructional DVD that this tuning is one of his favorites because of its simplicity. It is also used by the Goo Goo Dolls in their song "Black Balloon", which was tuned down a half step on the album but played live in Open D5. "Without You", "Emotion Sickness" and "Paint Pastel Princess" by Australian band Silverchair also uses the Open D5 tuning but down half a step. Fair to Midland use this tuning tuned down 1 full step (CGCGCC) and 1 1/2 steps (BF♯BF♯BB).
This tuning was used by Dave Wakeling of The Beat (known in North America as The English Beat) on the track "Save It For Later" from Special Beat Service. It was also used by Alex Lifeson of Canadian rock band Rush on the track "Hope" from Snakes & Arrows as well as Stone Gossard of American Rock Band Pearl Jam on the track "Let the Records Play". The DADAAD tuning has also been extensively used by Allen Maslen, guitarist and multi-instrumentalist with the British folk-rock band Meet On The Ledge. Tracks with this tuning include Only Angels, Gas Street Shuffle, Freeze, The Litten Tree and One For His Nob.
This tuning is also referred to as the "Zen Guitar" tuning. This is due to the fact that it is the tuning used by Philip Toshio Sudo, who wrote the book "Zen Guitar".
The Finnish guitarist, composer/ songwriter and guitar teacher Tomas Karlsson has written a lot of songs in this tuning.
- These songs can be heard on his 2015 album Zen Guitar Songs, available on Spotify and other streaming services.
- The sheet music to these songs can be found on his website http://www.tomaskarlsson.com/
- Tomas has also written a small lesson on using this tuning.
Nicknamed the "Wind of Change," this tuning was used by Peter Frampton on his song of the same name. Frampton discovered this tuning while browsing guitars at the home of George Harrison, who had a large collection of guitars in various tunings. When speaking of the tuning in an interview, Frampton said, "The low E and A strings drop down to D, the fourth string remains unchanged, the third string goes up to A, the second string up to D, and the first string up to F♯ , so there's a D triad on top and three Ds on the bottom. It's a very strange tuning, but oh my God, it sounds huge."
- "Alternate Tuning Guide - Open D Tuning - D A D F♯ A D".[unreliable source?]
-  Open D Tuning: Home
- Clint Goss (2011). "Simple Guitar Accompaniment for Native American Flute - DADFAD Tuning". Flutopedia. Retrieved 2011-11-28.
- Dave Wakeling tuning his guitar on 94.9 FM. Accessed 2010-04-15.
- Stone Gossard plays Let the Records Play Accessed 2013-10-19.