Anthony Roth Costanzo has ” pushed beyond the old-music limitations of traditional countertenors, performing new works written for him by composers including Nico Muhly, Jake Heggie, Suzanne Farrin, Steven Mackey and Matthew Aucoin.” New music star Claire Chase says, “what Anthony is doing is making that tool [the countertenor voice], with its range and its versatility, viable for composers in the 21st century.”