From Mosaic website:"The J.J. Johnson-Kai Winding Quintet, known more concisely as Jay & Kai, was one of the surprise successes of modern jazz in the '50s, a universe dominated by piano trios and trumpet and tenor saxophone stars. Among the earliest modern jazz trombonists, they crafted well thought out, inventive arrangements that highlighted the blend of their sounds and featured a co-operative competition that set off their distinctive styles.Such was their popularity that in 1955 they signed with Columbia Records and recorded Trombone For Two, a superb ten-tune album with Dick Katz, Paul Chambers and Osie Johnson. The program blended originals and standards with such unlikely bop fodder as "The Whiffenpoof Song" and "Let's Get Away From It All."In the next 13 months, the quintet went into the studio twice more, once with Katz, Milt Hinton and Shadow Wilson and then with Katz, Bill Crow and Kenny Clarke to record ten more tunes which appears Jay And Kai, which would become their final album apart from later reunion projects.All 20 Columbia studio tracks by this legendary quintet are now drawn together and mastered in 24-bit from the original analog tapes on this Mosaic edition of Trombone For Two!"