A new and notable bay area bluegrass band will debut next Thursday at Sweetwater in Mill Valley. The Papermill Creek Rounders are comprised of David Nelson (New Riders of the Purple Sage, David Nelson Band), Banana (The Youngbloods, Zero), Paul Shelasky (Lost Highway) and Paul Knight (Peter Rowan). The quartet will follow up the Sweetwater gig with a date the next day at the San Francisco Bluegrass and Old Time Festival at the Noe Valley Ministry.