"I Want You," released March 16, 1976, made it to No. 4 in the U.S. but stunned many: It was not a collection of songs but a symphony that, like the longing that drove Gaye, had ebbs and flows, light and shade. But in its blend of quiet soul, interstellar disco and Gaye's intricately multi-tracked, doo-wop-inspired vocals, it laid the blueprint for the R&B and neo-soul stars of the '90s and '00s.