Parker, Gillespie, and others working the bebop idiom joined the Earl Hines Orchestra in 1943, then followed vocalist Billy Eckstine out of the band into the Billy Eckstine Orchestra in 1944. The Eckstine band was recorded on V-discs, which were broadcast over the Armed Forces Radio Network and gained popularity for the band showcasing the new bebop style. The format of the Eckstine band, featuring vocalists and entertaining banter, would later be emulated by Gillespie and others leading bebop-oriented big bands in a style that might be termed "popular bebop". Starting with the Eckstine band's session for the De Luxe label on December 5, 1944 ("If That's the Way You Feel, I Want to Talk About You, Blowing the Blues Away, Opus X, I'll Wait and Pray, The Real Thing Happened to Me"), bebop recording sessions grew more frequent. Parker had left the band by that date, but it still included Gillespie along with Dexter Gordon and Gene Ammons on tenor, Leo Parker on baritone, Tommy Potter on bass, Art Blakey on drums, and Sarah Vaughan on vocals. "Blowing the Blues Away" featured a tenor saxophone duel between Gordon and Ammons.