The playing time of a phonograph record depended on the turntable speed and the groove spacing. At the beginning of the 20th century, the early discs played for two minutes, the same as early cylinder records. The 12-inch disc, introduced by Victor in 1903, increased the playing time to three and a half minutes. Because a 10-inch 78 rpm record could hold about three minutes of sound per side and the 10-inch size was the standard size for popular music, almost all popular recordings were limited to around three minutes in length. For example, when King Oliver's Creole Jazz Band, including Louis Armstrong on his first recordings, recorded 13 sides at Gennett Records in Richmond, Indiana, in 1923, one side was 2:09 and four sides were 2:52–2:59. COUNT 5
QSN1 What factors would effect playing time of a phonograph? ANS1 turntable speed and the groove spacing QSN2 What was the playing time common in the early 20th century? ANS2 two minutes QSN3 How many recordings did Kind Oliver's Creole Jazz band require? ANS3 13 QSN4 What was the normal size disc for popular music? ANS4 10-inch QSN5 What was the recording time available on a 12 inch disc? ANS5 three and a half minutes