Gillespie was at the peak of his powers throughout the 1950s and still the pacesetter among trumpeters. This double LP matches him with Stan Getz, the Oscar Peterson Trio, and drummer Max Roach for its first half. Getz, although identified with the "cool" school, thrived on competition and is both relaxed and combative on the uptempo explorations of "It Don't Mean a Thing" and "Impromptu." The remainder of this two-fer substitutes pianist John Lewis and drummer Stan Levey for Peterson and Roach and, most importantly, adds altoist Sonny Stitt to the frontline. The results are three uptempo stomps and just one medium-tempo performance. This is one of their better (and more explosive) studio jam sessions.