Bass – Dave Holland (tracks: 4 to 6), Ron Carter (tracks: 1 to 3)
Drums – Tony Williams
Electric Piano – Chick Corea (tracks: 4 to 6), Herbie Hancock (tracks: 4 to 6)
Engineer [Recording] – Fred Plaut (tracks: 2, 3), Stan Tonkel (tracks: 1, 4 to 6)
Liner Notes – James Isaacs
Piano – Herbie Hancock (tracks: 1 to 3)
Producer [Original Recordings] – Teo Macero
Reissue Producer – Bob Belden, Michael Cuscuna
Tenor Saxophone – Wayne Shorter
Trumpet – Miles Davis
Written-By – Miles Davis (tracks: 5, 6), Wayne Shorter (tracks: 1 to 4)
Notes
Recorded at Columbia 30th Street Studio, NYC on June 7 (#1), June 13 (#2) and June 23, 1967 (#3) and at Columbia Studio B, NYC on November 11 (#4 & #5) and November 12 (#6), 1968.
Tracks 1-5 originally issued on Water Babies (Columbia C 34396). Track 5 was issued on PC 34396 as "Dual Mr. Tillmon Anthony" by William Process. Track 6 bonus track - not on original LP. Originally issued, without its introduction, on Circle In The Round (Columbia PC2 36278).