Whart-Brothers Johnson had 3 top 10 Billboard hits, strong album sales and many top 40 r&b hits. The Trammps had 2 other top 40 Billboard hits. IMO the best disco/r&b examples are...
Rock The Boat-Hues Corporation
The Hustle-Van McCoy
Turn The Beat Around-Vicki Sue Robinson
Rock The Boat-Hues Corporation
The Hustle-Van McCoy
Turn The Beat Around-Vicki Sue Robinson