The Philly R&B foursome’s hits reveal a perfect snapshot of superior ‘90s soul. They were masters of transcendent harmonies and meticulous songcraft; wholesome familial tributes, such as “A Song for Mama,” and clean language made them multigenerational touchstones. “Motownphilly” is a romping banger, laced with horns and a new jack swing chorus; “I’ll Make Love to You” is, arguably, the birthplace of the modern ballad; and “End of the Road” is a master class in the silky slow jam.