 Notably, Lynn Taitt, the Trinidadian-born guitarist credited with creating the rock steady beat while living and working in Jamaica, and long time colleague of Grennan's, appeared on several Ska Rocks recordings.Grennan also worked on music for, or appeared in other films including "Harold and Maude", "Fresh Fruit in Foreign Places", and later "Sleepyheads", and "Soho".He was involved in the original musical efforts for the unrealised production "Reggae on Broadway".