Thomas has written and MD'ed the music for over 100 shows with dozens of theatre companies all over the world, across a wide range of genres, from village hall touring to large scale open air promenades, from local rep to Broadway. His theatre music has been scored for everything from solo harp to brass sextet, for choirs and chamber ensembles. Much of his work is written for top musicians, and he is also highly skilled at composing for actor-musician casts. He's also written for BBC radio drama.