His "Private Party" album was when my funk collection started to take off. I wore that joint out. It's interesting and a surprise to read that he co-wrote for Slick's "Mary Jane", although Bobby's name is not archived in ASCAP's database:

http://www.ascap.com/ace/search.cfm?requesttimeout=300&mode=results&searchstr=430271548&search_in=i&search_type=exact&search_det=t,s,w,p,b,v&results_pp=10&start=1