He was probably at his peak in the late 50s and in to the 60s along with many of the great R&B groups and singers of the time. That was probably the "golden" era for the music. Unfortunately, little harder to find nowadays, although I am lucky enough to have a "smooth jazz/R&B station" close by that plays a lot of the current and some older music.

Unfortunately, as we can see, he was getting pretty obese and quite frankly, it was surprising he actually lived to age 70.