Mongo & McCall
This soul duo hides the names of West Coast producer Arthur Freeman and Wilbert P James. You gotta love the harmony and interplay of the two voices on 
So Help Me Baby, as well as the fine “climbing” chord changes, strong keyboard fills and subdued horns on this one. Jive talk flip is pretty good too.
Note ~ The Arthur Freeman here is a different guy to this singer on Fame and this artist from Florida.