Consider this a first draft of performing groups in the Triangle area!
Band and Orchestra
North Carolina Symphony
http://www.ncsymphony.org/
North Carolina Opera
http://www.ncopera.org/
Triangle Brass Band
http://www.trianglebrass.org/
Raleigh Symphony
http://raleighsymphony.org/
Durham Symphony
http://www.durhamsymphony.org/
Chamber Orchestra of the Triangle
http://www.chamberorchestraofthetriangle.org/
Triangle Wind Ensemble
http://www.trianglewind.org/
Durham Community Concert Band
http://www.durhamband.org/
Cary Town Band
http://www.carytownband.org/
Raleigh Concert Band
http://theraleighconcertband.org/
Chapel Hill Philharmonia
http://www.chapelhillphilharmonia.org
Raleigh Jazz Orchestra
http://www.raleighjazz.org/
Durham Jazz Orchestra
http://www.durhamjazz.org/
The Really Terrible Orchestra of the Triangle (RTOOT)
http://www.rtoot.org/
Choral
Chorale Society of Durham
http://choral-society.org/
North Carolina Master Chorale
http://ncmasterchorale.org/
Concert Singers of Cary
http://concertsingers.org/
Performing Groups and Artists
Triangle String Quartet
http://trianglestringquartet.com/
Triangle Tuba Quartet
http://triangletubas.com/
Boylan Bridge Brass
http://www.boylanbridgebrass.com/