by Andrew HamiltonThe Dynamic Superiors plus Nicolas Ashford and Valerie Simpson equals some stupendous sounds. The two groups brought out the best in each other. No doubt the late Sylvester, who surfaced later, copied lead singer Tony Washington's phrasings. "Shoe Shoe Shine" is one of the best Ashford/Simpson songs; it also turned out to be the D.C. natives' most popular record, with the exciting "Leave It Alone" a close second. A second lead with a good tenor provided a good foil for Washington's cloud-high vocals on most selections. A must for vocal-group fanatics.