Maxi single

A maxi single or maxi-single (sometimes abbreviated to MCD or CDM) is a music single release with more than the usual two tracks of an A-side song and a B-side song.

The first maxi singles

The term came into wide use in the 1970s, where it usually referred to 7-inch vinyl singles featuring one track on the A-side and two on the B-side. The 1975 reissue of David Bowie's "Space Oddity", where the featured song is coupled with "Changes" and "Velvet Goldmine", is a typical example. By the mid-1970s, it was used to refer to 12" vinyl singles with three or four tracks (or an extended or remixed version of the lead single/song) on the A-side, with an additional two or three tracks on the B-side; the B-side would initially be used by DJs. Later, in the 1980s, a typical practice was to release a two-song single on 7" vinyl and cassette, and a maxi-single on 12" vinyl.

These first 12" maxi-singles were promotional and mostly sent to discotheques and radio stations. Examples of such promos—released at almost same time in 1975—are Gary Toms Empire  – "Drive My Car", Don Downing – "Dream World", Barrabas – "Mellow Blow", The Trammps – "Hooked for Life", Ace Spectrum – "Keep Holdin' On", South Shore Commission – "Train Called Freedom", The Chequers – "Undecided Love", Ernie Rush – "Breakaway", Ralph Carter – "When You're Young and in Love", Michael Zager & The Moon Band Feat. Peabo Bryson – "Do It with Feeling", Monday After – "Merry-Go-Round", The Ritchie Family – "I Want to Dance" and Frankie Valli – "Swearin' to God".

12-inch single

The 12-inch single (often simply called 12") is a type of gramophone record that has wider groove spacing and shorter playing time compared to typical LPs. This allows for louder levels to be cut on the disc by the cutting engineer, which in turn gives a wider dynamic range, and thus better sound quality. This record type is commonly used in disco and dance music genres, where DJs use them to play in discos or clubs. They are played at either 33⅓ or 45 rpm.

Technical features

12-inch singles typically have much shorter playing time than full-length LPs, thus require fewer grooves per inch. This extra space permits a broader dynamic range or louder recording level as the grooves' excursions (i.e., the width of the groove waves and distance traveled from side to side by the turntable stylus) can be much greater in amplitude, especially in the bass frequencies so important for dance music. Many record companies began producing 12-inch (30 cm) singles at 33⅓ rpm, although 45 rpm gives better treble response and was used on many 12-inch singles, especially in the UK.