Double EP
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A Double extended play (Double EP) is the name typically given to vinyl records or CDs containing two discs that would normally qualify for the name of EP. The name is thus analogous to double album. These may be in one of two formats - a pair of 7" discs recorded at 33 rpm, or two 12" discs recorded at 45rpm.
Double EPs are rare, since the amount of material recordable on a double EP could usually be more economically and sensibly recorded on a single LP. There are a limited number of double EPs which serve other purposes, however. An example of this is the Dunedin Double EP, which contains tracks by four different bands. Using a double EP in this instance allowed each band to have its tracks occupying a different side.
The format is also useful when an album's-worth of material is being pressed by a small plant geared for the production of singles rather than albums. The unusual format also has novelty value which can be turned to advantage for publicity purposes.
The most famous double EP is arguably the original release of The Beatles' Magical Mystery Tour, originally released as a double 7" EP before being extended from its original six songs and released as a full album.