Gillespie, pianist Bud Powell, and a rhythm section accompany; two of the songs feature his quintet, with James Moody.

The vocal parts by the Double Six were overdubbed on top of recordings by Gillespie, Powell, Pierre Michelot, and Kenny Clarke that had been made in July 1963.

Two tracks were recorded with James Moody, Kenny Barron, Chris White, and Rudy Collins in Chicago in September 1963.

Commenting on the vocalists, he wrote, "The results impress partly as a technical tour de force, and the Double Six must be respected for its accuracy and peerless intonation, but these values are a means to an artistically complete end.

"[3] The Penguin Guide to Jazz gave the album 3.5 of 4 stars, applauding Gillespie's "superb solos" and the Double Six's "supremely athletic vocals.