A double album is an audio album which spans two units of the primary medium in which it is sold (especially records and compact discs). A double album is typically, though not always, released because the recording is longer than the capacity of the medium. Recording artists often think of double albums as a single piece artistically; however, there are exceptions such as Pink Floyd's Ummagumma, one live album and one studio record packaged together, and OutKast's Speakerboxxx/The Love Below, consisting of one practical solo album by each member of the hip-hop duo. Particularly with the advent of the compact disc, albums are sometimes released with a bonus disc featuring additional material as a supplement to the main album, with live tracks, studio out-takes, cut songs, or older unreleased material. A new innovation is the accompaniment of a CD with a DVD of related material, such as video related to the album or DVD-Audio versions of the same recordings. These could be regarded as a new form of double album; some such discs are also released on as a two-sided format called DualDisc.

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