Rob Halford and Brad Delp are both what?
Brad Delp Bradley Edward Delp (June 12, 1951 – March 9, 2007) was an American singer and songwriter, best known as the lead vocalist of the rock bands Boston and RTZ.
Robopop Daniel Omelio, often known by his stage name "Robopop", is a producer and songwriter based in New York City. He is best known for his work on successful singles by Maroon 5, Gym Class Heroes and Lana Del Rey.