(215) 605-5328john@johngrossman.com Welcome to John Grossman Entertainment Services. We supply the Tri-State Area with quality Disc Jockey Entertainment, Trivia Services, and Voice Overs. John Grossman Entertainment Services will provide you with your music for your day. © 2013 John Grossman Entertainment Services. All rights reserved. All items on this website are copyrighted. Photographs are used by permission.