In music, a single, or 45, is a release, typically a song recording of lesser tracks than an LP record, or an album. One can be released for sale to the public in a variety of formats. In most cases, a single is a song that is released separately from an album, although it usually also appears on an album. In other cases a recording released as a single, or 45, may not appear on an album. Despite being referred to as a single, in the era of music downloads, singles can include up to as many as three tracks. The biggest digital music distributor, the iTunes Store, accepts as many as three tracks less than ten minutes each as a single. Any more than three tracks on a musical release or thirty minutes in total running time is an extended play and is called an EP or, if over six tracks long, an album.