Pubradio outlets in New York and the Carolinas are kicking off special musical performance series for local and worldwide audiences, beginning tonight with a live performance by Grizzly Bear from New York’s WNYC. The show launches WNYC’s American Music Festival, which concludes May 27 with a live concert featuring the world premiere of new work by acclaimed jazz drummer Dafnis Prieto. Tomorrow, on the opening day of the Spoleto Festival USA, South Carolina’s ETV Radio and WDAV in Charlotte, N.C., co-present Spoleto Today and Carolina Classics, special series to be presented weekdays during the 17-day festival of music, theatre and dance performances in Charleston, S.C. The pubcasters forged a new partnership to broadcast festival programming throughout the Carolinas, and they are providing streamed and archived performances and other coverage online. WDAV extends its daily coverage from Spoleto with The Mozart Cafe, hosted by Jennifer Foster from noon to 1 p.m. daily.