The term "jam session" usually elicits a groan from most live-music fanatics. But the one that takes place every Wednesday night at The Prophet Bar is like nothing you'll see in town. Hosted by Grammy-winning R&B singer Shaun Martin, the night of improvisational neo-soul and R&B sees the Prophet Bar crowded with people each week — sometimes well after the 2 a.m. curfew. And with good reason: Erykah Badu musical director R.C. Williams and his band The Gritz make The Prophet Bar feel like it belongs in another city in a different era. DJ Jay Clipp starts things off with a bass-heavy mix of hip-hop and R&B.