Bill Withers has written two bona fide classics ("Ain't No Sunshine" and "Lean on Me"), recorded a slew of memorable hits, and had songs covered by everyone from Joe Cocker to Isaac Hayes to Kiss. Still, he's underappreciated. His voice is smooth, his singing is subtle, and his songs move along over sinuous, sexy grooves. It's all so effortless that it's easy to overlook how substantial Withers's work really is. Never flashy, his best songs burn with a heat that lingers long after the last note has been played. This slender 10-track collection brings together a few songs from his remarkable early-'70s Sussex albums, including such hits and near hits as "Grandma's Hands," "Who Is He? (And What Is He to You?)," and the seriously funky "Use Me," as well as some gems from the later '70s (including "Lovely Day"). Greatest Hits is a nice, succinct introduction to Withers's work, but fans would be better off with the more complete Lean on Me career overview.