The most common form of the vinyl single is the 45 or 7-inch.
The names are derived from its play speed, 45 rpm, and the standard diameter, 7 inches (18 cm).
The biggest digital music distributor, i Tunes, accepts as many as three tracks less than ten minutes each as a single, as does popular music player Spotify.
in the late 19th century, when the gramophone record began to supersede phonograph cylinders in commercially produced musical recordings.
78 rpm was chosen as the standard because of the introduction of the electrically powered, synchronous turntable motor in 1925, which ran at 3600 rpm with a 46:1 gear ratio, resulting in a rotation speed of 78.26 rpm.
With these factors applied to the 10-inch format, songwriters and performers increasingly tailored their output to fit the new medium.
In most cases, a single is a song that is released separately from an album, although it usually also appears on an album.
"New" refers to a brand-new, unused, unopened, undamaged item, and "Used" refers to an item that has been used previously.
Nevertheless, the concept of a single for an album has been retained as an identification of a more heavily promoted or more popular song (or group of songs) within an album collection.
Despite being referred to as a single, singles can include up to as many as three tracks on them.
The 3-minute single remained the standard into the 1960s, when the availability of microgroove recording and improved mastering techniques enabled recording artists to increase the duration of their recorded songs.
The breakthrough came with Bob Dylan's "Like a Rolling Stone".
As stereo recordings became popular in the 1960s, almost all 45 rpm records were produced in stereo by the early 1970s.