with Thelonious Monk alongside an assortment of musicians including Joe Guy, Hot Lips Page, Roy Eldridge, Don Byas, and Charlie Christian. Christian is featured in recordings from May 12, 1941 (Esoteric ES 548). Charlie Parker and Dizzy Gillespie were both participants at a recorded jam session hosted by Billy Eckstine on February 15, 1943, and Parker at another Eckstine jam session on February 28, 1943 (Stash ST-260; ST-CD-535). Formal recording of bebop was first performed for small specialty labels, who were less concerned with mass-market appeal than the major labels, in 1944. On February 16, 1944, Coleman Hawkins led a session including Dizzy Gillespie and Don Byas, with a rhythm section consisting of Clyde Hart (piano), Oscar Pettiford (bass) and Max Roach (drums) that recorded "Woody'n You" (Apollo 751), the first formal recording of bebop. Charlie Parker and Clyde Hart were recorded in a quintet led by guitarist Tiny Grimes for the Savoy label on September 15, 1944 (Tiny's Tempo, I'll Always Love You Just the Same, Romance Without Finance, Red Cross). Hawkins led another bebop-influenced recording session on October 19, 1944, this time with Thelonious Monk on piano, Edward Robinson on bass, and Denzil Best on drums (On the Bean, Recollections, Flyin' Hawk, Driftin' on a Reed; reissue, Prestige PRCD-24124-2). 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