A brief history of the 45
Singles have been issued in various formats, including 7-inch, 10-inch and 12-inch vinyl discs. 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-inch. The 7-inch 45 rpm record was introduced in 1949 by RCA as a… Read more »