The Florida Supreme Court heard arguments in a case focused on whether satellite radio giant Sirius XM should have to pay royalties to The Turtles, a pop duo that recorded such iconic oldies as “Happy Together” more than four decades ago.

Flo & Eddie, a California-based company whose principals are Turtles vocalists Mark Volman and Howard Kaylan, filed the lawsuit in 2013 against Sirius, which has more than 100 channels and over 24 million subscribers. Flo & Eddie also filed lawsuits against the satellite radio company in New York and California.