Two years after D'Angelo brought the organic sound and emotional passion of R&B to the hip-hop world with 1995's Brown Sugar, Erykah Badu's debut performed a similar feat. While D'Angelo looked back to the peak of smooth '70s soul, though, Badu sang with a grit and bluesiness reminiscent of her heroes, Nina Simone and Billie Holiday. "On & On" and "Appletree," the first two songs on Baduizm, illustrated her talent at singing soul with the qualities of jazz. With a nimble, melodic voice owing little to R&B from the past 30 years, she phrased at odds with the beat and often took chances with her notes. Like many in the contemporary rap world, though, she also had considerable talents at taking on different personas.