Press - Groovin` The Blues - Rockin` The Groove - Livingblues.com VARIOUS ARTISTS Groovin' the Blues: When Groove Was More Than Just a Habit Bear Family — BCD 17411 Rockin' the Groove: When Groove Was More Than Just a Habit Bear Family - BCD 17212 Due to the World War II shortage of shellac, a resin that was used in the manufacturing of 78 r.p.m. records, major labels such as RCA Victor and Columbia cut way back on recording music that appealed primarily to African Americans and other minority populations. largely limiting their focus to mainstream pop. Independent companies such as Gilt Edge. Juke Box. Philo. Exclusive and Apollo emerged to fill the void and soon dominated the blues and gospel markets.