From this website:

   A pairing one might not imagine is Nils Lofgren and the late author Clive Cussler on Whatever Happened To Muscatel. Nils remembers “My dear, departed friend Clive Cussler, one of the all-time great adventure writers, asked me to write this country song with him. It was a joy to research the lyrics with him of old, rotgut liquors gone by the wayside, in his historic writing room in AZ. A great honor and creative adventure to team up with Clive. Rest in Peace dear, brilliant friend.”