Trivia: well into the 1970s, promotional copies of hit songs were released to U.S. radio and record stores on vinyl 7-inch 45 RPM format, one side in mono, and

Trivia: well into the 1970s, promotional copies of hit songs were released to U.S. radio and record stores on vinyl 7-inch 45 RPM format, one side in mono, and one side in stereo.