On March 4 & 5, 1977, April Wine was booked to play a charity concert at the famed El Mocambo Club in Toronto, Ontario. Co-headliner on the bill was a band called "The Cockroaches", who turned out to be The Rolling Stones. The pseudonym was a poorly kept secret and huge crowds turned out for the event. April Wine's performance was captured and released as the album "Live at the El Mocambo". The band got its first chance at touring the U.S. following the El Mocambo gig, first opening for The Rolling Stones, then for various popular headliners, including Styx and fellow Canadian band Rush.