7-inch 45 rpm records came out in the 1970s.
7-inch 45 rpm records came out in the 1970s.
what year did 7-inch 45 rpm records come out?
1970s
the 7-inch 45 rpm record was released 31 march 1949 by rca victor as a smaller, more durable and higher-fidelity replacement for the 78 rpm shellac discs. the first 45 rpm records were monaural, with recordings on both sides of the disc. as stereo recordings became popular in the 1960s, almost all 45 rpm records were produced in stereo by the early 1970s. columbia records, which had released the  rpm 12-inch vinyl lp in june 1948, also released  rpm 7-inch vinyl singles in march 1949, but they were soon eclipsed by the rca victor 45. the first regular production 45 rpm record pressed was "peewee the piccolo" rca victor 47-0146 pressed 7 december 1948 at the sherman avenue plant in indianapolis, r.o. price, plant manager.
single (music)
terms such as "long-play" (lp) and "extended-play" (ep) describe multi-track records that play much longer than the single-item-per-side records, which typically do not go much past four minutes per side. an lp can play for up to 30 minutes per side, though most played for about 22 minutes per side, bringing the total playing time of a typical lp recording to about forty-five minutes. many pre-1952 lps, however, played for about 15 minutes per side. the 7-inch 45 rpm format normally contains one item per side but a 7-inch ep could achieve recording times of 10 to 15 minutes at the expense of attenuating and compressing the sound to reduce the width required by the groove. ep discs were generally used to make available tracks not on singles including tracks on lps albums in a smaller, less expensive format for those who had only 45 rpm players. the term "album", originally used to mean a "book" with liner notes, holding several 78 rpm records each in its own "page" or sleeve, no longer has any relation to the physical format: a single lp record, or nowadays more typically a compact disc. the term ep is still used for a release that is longer than a single but shorter than an album, even if it is not on vinyl format.
phonograph record