By Scott Tady Toto holds the line, Vince Gill croons country, Teddy Swims sings soulfully and Pantera gets heads banging in what’s shaped up to be a memorable month of music in Western Pennsylvania.

This groundbreaking twist on The Wizard of Oz changed the face of Broadway—from its iconic score packed with soul, gospel, rock, and finger-snapping 70s funk to its stirring tale of Dorothy’s ...