WTOP's Jason Fraley interviews Tower of Power saxophonist and songwriter Emilio Castillo as the classic R&B band plays Bethesda Theater in Bethesda, Maryland this Friday night. They discuss the band’s biggest hits from “What is Hip?” to “So Very Hard to Go." (Theme Music: Scott Buckley's "Clarion") Learn more about your ad choices. Visit megaphone.fm/adchoices