A former member of '90s R&B hitmakers Tony! Toni! Tone!, Raphael Saadiq also has a deeper resume: as a producer and songwriter for many of R&B, soul and hip-hop's biggest names--and now as an established solo artist with an addictive retro-soul sound. His latest album, "Stone Rollin'," is due out in May. He played March 16 at Stubb's in Austin, TX as a part of South by Southwest.