Seeburg Music Library - Industrial - 1966-12-26 IN-115 B RECORDS The Seeburg Background Music record is a vinyl record of a non-standard size of 9 inches diameter with a 2 inch center hole. The recording is monaural, with a playing speed of 16⅔ rpm and a density of 420 grooves per inch. Each side contains approximately 40 minutes of music, typically 20 songs. Records in every series are numbered 1-28 or 101-128. These numbers tell you nothing except where the record was supposed to go in a stack.
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