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A double album (or double record) is an audio album that spans two units of the primary medium in which it is sold, typically either records or compact disc. A double album is usually, though not always, released as such because the recording is longer than the capacity of the medium. Recording artists often think of double albums as being a single piece artistically; however, there are exceptions, such as John Lennon's Some Time in New York City (which consisted of one studio record and one live album packaged together) and OutKast's Speakerboxxx/The Love Below (effectively two solo albums, one by each member of the duo). Since 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. One innovation was the inclusion of a DVD of related material with a compact disc, such as video related to the album or DVD-Audio versions of the same recordings. Some such discs were also released on a two-sided format called DualDisc.
Depending on the media used, some releases were double albums in one format and single albums in another. For example, a gramophone record (vinyl LP) consisting of two discs of less than 80 minutes in total could be fit onto a single standard-length compact disc (CD). Other times, track order could vary between two different media by rearranging the tracks in one medium, or a more efficient use of space could be made; for example, reducing a double album in LP format to a single cassette tape.
The same principles apply to the triple album, which comprises three units. Packages with more units than three are often referred to as a box set.