For band/orchestra concerts I like to go with a nice even
leko wash from the catwalk in light blue/amber, add two lekos to make the director's stand an area (they really like to see their music) and a whole lot of scoops for downlight. If your band has shells behind it I like to shoot some pars at them to give them some punch (make sure NOT to run these at 100% or you will blind people).