Music exec William Sinnett “Jock”Elliott III died in Los Angeles Monday. He was 36.Services will be held on Saturday, at 3:30 at Gates, Kingsley & Gates Smith, 4220 S. Sepulveda, Culver City. Elliott was a marketing director at Geffen Records, a division of Universal Music Group. He began his career at REN Management before moving on to Rhino Records. He established himself while at Epic Records, helping break the band Incubus, among others. He moved on to MCA records in 2002, which later became Geffen Records. Donations may be made to the Mr. Holland’s Opus Foundation, 15125 Ventura Blvd., Suite 204, Sherman Oaks, CA 91403.