baritone saxophone Gerry Mulligan
bass Peck Morrison
drums Dave Bailey
liner notes Ira Gitler
tracks a1, b4 piano Gerry Mulligan
research, compiled by [for japanese release] Kiyoshi Koyama
tenor saxophone Zoot Sims
trumpet Jon Eardley
valve trombone Bob Brookmeyer
Record Company Mercury Record Corporation
Phonographic Copyright (p) Nippon Phonogram Co., Ltd.
Manufactured By Nippon Phonogram Co., Ltd.
Distributed By Nippon Phonogram Co., Ltd.
Ⓟ 1984
Recorded:
September 21, 1955 (A1, A2, A3)
September 22, 1955 (B1, B2, B3, B4)

B4 is an alternate version of A1, though not explicitly mentioned.
EmArcy ... a product of Mercury Record Corporation, Chicago, Illinois

Matrix / Runout: 195J-35 A (Matrix print label A)
Matrix / Runout: 195J-35B (Matrix print label B)
Matrix / Runout: V 〄 Ⓑ 1 9 5 J - 3 5 A 1 1 1 (Runout side A stamped)
Matrix / Runout: 1 9 5 J - 3 5 B 1 1 1 (Runout side B stamped)
Rights Society: JASRAC (Rear Cover)
Other: N · 9 · 5 (Jap. release letter code (rear cover))