Moulton’s position as the premiere mixer and “fix it man” for pop singles ensured that this fortunate accident would instantly become industry practice. This would perhaps have been a natural evolution: As songs became much longer than had been the average for a pop song, and the DJ in the club wanted a sufficient sound level (more precisely, greater dynamic range), the format would have surely had to be changed from the 7 inch (18 cm) single eventually.
Also worth noting is that the visual spacing of the grooves on the 12″ assisted the DJ in locating the approximate area of the “breaks” on the disc’s surface (without having to listen as he dropped and re-dropped the stylus to find the right point). A quick study of any DJ’s favorite discs will reveal mild wear in the “break points” on the discs surface that can clearly be seen by the naked eye, which further eases the “cueing” task (a club DJ’s tone-arm cartridge will be heavily weighted and mild wear will seldom spoil the sound quality). Many DJ-only remix services, such as Ultimix and Hot Tracks, issued sets with deliberately visualised groove separations (i.e., the record was cut with narrow and wider spacings that could be seen on the surface, marking the mix points on the often multi-song discs).
A broader dynamic range or louder recording level requires more space as the grooves’ excursions (i.e., the width of the groove waves and distance traveled from side to side by the turntable stylus) become 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 33 1/3 rpm, as the slower speed enhances the bass on the record. By the same token, however, 45 rpm gives better treble response and was used on many 12-inch singles, especially in the UK.
The first official promotional 12″ single was Southshore Commissions “Free Man”. At first, these special versions were only available as promotional copies to DJs. Examples of this promos –released at almost the same time in 1975 are, GARY TOMS EMPIRE – “Drive My Car”, DON DOWNING – “Dream World”, BARRABAS – “Mellow Blow”, THE TRAMPS – “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 FRANKI VALLI – “Swearin’ to God”.
By 1976, with the release of “Ten Percent” by Double Exposure on Salsoul Records, the new format was sold to the general public. Another possible candidate for the first such release might be the “Theme From Shaft” by Isaac Hayes (Stax 5C 052Z-62266 released 1971). The second song found on a 12″ Single is Love to Love You Baby by Donna Summer, released in 1976. This song was originally a full side of her North American debut release, but released again in early 1977 backed with Try Me, I Know We Can Make It, on the Oasis/Casablanca label.
Increasingly in the 1980s, many pop and even rock artists released 12-inch singles that included longer, extended, or remixed versions of the actual track being promoted by the single. These versions were frequently labeled with the parenthetical designation “12-inch version”, “12-inch mix”, “extended remix”, “dance mix”, or “club mix”.
Close up shot of a 12″ (30 cm) single showing the wide grooves.
Later musical styles took advantage of this new format and recording levels on vinyl 30 cm (12 in) maxis have steadily increased, culminating in the extremely loud (or “hot”) cuts of drum and bass records of the 1990s and early 2000s.
Many record labels produced mainly 12-inch singles (in addition to albums) during the 1980s, such as Factory Records, who only ever released a handful of 7-inch (18 cm) records. One of Factory’s resident artists, New Order, produced the biggest-selling 12 inch record ever in United Kingdom, “Blue Monday”, selling over one million copies (some sources say more than three million). It was somewhat helped by the fact that Factory did not release a 7-inch version of the single. By way of comparison, “Blue Monday” came in 76th on the 2002 UK list of all-time best-selling singles.