Four women who call themselves Anonymous 4 take the stage tonight in Meymandi Concert Hall in the Progress Energy Center for the Performing Arts in downtown Raleigh. The vocal group formed in 1986 to experiment with the sound of medieval music. Darol Anger and Scott Nygaard also perform.

When: 8 p.m. Where: Meymandi Hall, Progress Energy Center, Raleigh. Cost: $26-$30. Info: 515-1100.