Plus 4 was originally released on Prestige in 1956 and features Sonny Rollins playing with the Cliff Brown/Max Roach Quintet. Described as a particularly strong hard bop set, the album contains 5 cuts, including 2 Rollins originals "Pent-Up House" and one of his best known pieces, "Valse Hot".

This new edition of the album is released as part of the OJC Series on 180-gram vinyl pressed at RTI with all-analogue mastering from the original tapes at Cohearent Audio and a Stoughton Tip-On Jacket.