Miles Davis – trumpet (all) Kai Winding – trombone (January 1949) J. J. Johnson – trombone (April 1949, March 1950) Junior Collins – French horn (January 1949) Sandy Siegelstein – French horn (April 1949) Gunther Schuller – French horn (March 1950) Bill Barber – tuba (all) Lee Konitz – alto saxophone (all) Gerry Mulligan – baritone saxophone (all) Al Haig – piano (January 1949) John Lewis – piano (April 1949, March 1950) Joe Shulman – bass (January 1949) Nelson Boyd – bass (April 1949) Al McKibbon – bass (March 1950) Max Roach – drums (January 1949, March 1950) Kenny Clarke – drums (April 1949) Kenny Hagood – vocal ("Darn That Dream" only)