1975. I would guess that the reasons are contractual, as that music was on the Curtom label, rather than Stax. The second disappointment is the sound quality. The fidelity is relatively poor, as it is on similar Stax collections on Fantasy from Johnnie Taylor and the Emotions. It is not as bad as the early pressings on a well known Philadelphia reissue label. As I bought this CD when it first became available, I would hope that the problem has been corrected.