 After appearing as a sideman in the R&B-oriented Cootie Williams Orchestra through 1944, Bud Powell was in bebop sessions led by Frankie Socolow on May 2, 1945 for the Duke label ("The Man I Love, Reverse the Charges, Blue Fantasy, September in the Rain"), then Dexter Gordon on January 29, 1946 for the Savoy label ("Long Tall Dexter, Dexter Rides Again, I Can't Escape From You, Dexter Digs In").The growth of bebop through 1945 is also documented in informal live recordings.By 1946 bebop was established as a broad-based movement among New York jazz musicians, including trumpeters Fats Navarro and Kenny Dorham, trombonists J. J. Johnson and Kai Winding, alto saxophonist Sonny Stitt, tenor saxophonist James Moody, baritone saxophonists Leo Parker and Serge Chaloff, vibraphonist Milt Jackson, pianists Erroll Garner and Al Haig, bassist Slam Stewart, and others who would contribute to what would become known as "modern jazz".