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In music, a medley is a piece composed from parts of existing pieces, usually three, played one after another, sometimes overlapping. They are common in popular music, and most medleys are songs rather than instrumental. A medley which is a remixed series is called a megamix, often done with tracks for a single artist, or for popular songs from a given year or genre.
The Grateful Dead played many covers as well as their own songs as medleys, most notably in the live setting. Examples include a medley of their covers of Not Fade Away and Goin' Down The Road Feelin' Bad and a medley of their original China Cat Sunflower with a cover of I Know You Rider. Some of their original songs were written as or consistently performed as medleys, such as Help on the Way > Slipknot > Franklin's Tower and Cryptical Envelopment > The Other One. In addition, the band would perform songs as medleys in a live setting by creating a segue between songs that were not originally recorded as such, with examples being Playin' In The Band > Uncle John's Band as well as Eyes of the World > Estimated Prophet among many others. (The > symbol denotes a musical segue from one song to the next)
"The Golden Slumbers Medley" (1969); this medley is a notable section of the 19-minute long "Abbey Road medley". It begins with "Golden Slumbers" and concludes with "The End". (the ending track of the album; despite the reason that "Her Majesty" is the last track to be played on the album)
"Weird Al" Yankovic has had a polka medley on most of his albums. Most often, Yankovic's polka medleys feature snippets of hit songs that are popular at the time he records an album, though he sometimes chooses songs of a similar genre (and in one case, different songs recorded by a single group) for a themed medley.
Metallica performed a medley of Ride The Lightning, No Remorse, Hit The Lights, The Four Horsemen, Seek And Destroy and Fight Fire With Fire. This was called the Kill/Ride medley and can be seen on the Cunning Stunts (video) DVD.
Bon Jovi will also do a lot of medleys during live concerts usually "Bad Medicine" and a cover song "Shout" or "Pretty Woman." They also will play "I'll Sleep When I"m Dead" with "Jumping Jack Flash" or "Papa was a Rolling Stone."
Goodbye, My Coney Island Baby-1948 by Les Applegate. The short songs "Coney Island Baby" and "We All Fall" were first combined as a medley by Les Applegate in 1924 for the musical comedy "No, No, Nanette".
Toto did two medleys in 2003. tour, first one consists of: Girl Goodbye, Goodbye Elenore, Child's Anthem and I'll Supply The Love. Second one includes: Waiting For Your Love, Georgy Porgy, Lion, Hydra, English Eyes and Till The End
Laura Marling performed a live medley of two of her songs, Don't Ask Me Why and Salinas.
Metallica recorded a medley called "Ronnie Rising" for This Is Your Life, a tribute album for Ronnie James Dio. The medley is made up of the songs "A Light in the Black", "Stargazer", and "Tarot Woman", which are all tracks from Rising, the second album Dio recorded as the lead vocalist for Rainbow, hence the name of the song.
Luis Miguel has some medleys which were recorded live and released on live albums. These are "Romance", "Segundo Romance" and "Romances". They all contained bolero songs from the albums with the same name. He has also a live medley from El Concierto.