Premise: Jon Ryan Schaffer (born March 15, 1968) is an American heavy metal musician. He is best known as the guitarist and last remaining original member of the Florida-based heavy metal band Iced Earth, which he formed in 1985 under the name "Purgatory". He also sings in his side project Sons of Liberty and played guitar for Demons and Wizards, his collaboration with Blind Guardian frontman Hansi Kürsch.
Hypothesis: :Sons of Liberty and Demons and Wizards are music bands.