tracks b2 to b4 alto saxophone Lou Donaldson tracks a4, b1 alto saxophone Sahib Shihab tracks a4, b1 bass Al McKibbon tracks a1 to a3 bass John Simmons tracks b2 to b4 bass Percy Heath tracks a4, b1 drums Art Blakey tracks b2 to b4 drums Kenny Clarke tracks a1 to a3 drums Shadow Wilson engineer [recording] Doug Hawkins engineer [recording] Harry Smith tracks b2 to b4 piano John Lewis piano Thelonious Monk producer [all sessions] Alfred Lion producer [produced for release], liner notes Michael Cuscuna tracks a1 to a3, b2 to b4 vibraphone [vibes] Milt Jackson tracks a1 to a3 vocals Kenny Hagood Record Company Capitol Records, Inc. Manufactured By Toshiba EMI Ltd Licensed From Capitol Records, Inc. Recorded At Apex Studios, New York Recorded At WOR Studios A1 to A3 recorded at Apex Studios, NYC, on July 2, 1948. A4, B1 recorded at WOR Studios, NYC, on July 23, 1951. B2 to B4 recorded at WOR Studios, NYC, on April 7, 1952.