Two main themes dominate his music: the life, work and ideas of Lewis Carroll (e.g. the chamber piece Snark-Hunting, the choral piece Songs for Snark-Hunters, and the full-length choral music theatre piece Boojum!); and the plight of the people of East Timor (e.g. Kdadalak (For the Children of Timor) and VENCEREMOS!). A multimedia version of the "audio-visual music theatre" piece Quito - about schizophrenia and East Timor - has been performed many times in many countries by The Song Company. One of his pieces - For Marimba & Tape - is the most-performed piece of Australian so-called "serious art-music" (it exists in versions for other instruments, too, including For Clarinet & Tape). For many years Director of the Electronic Music Studio at the Sydney Conservatorium of Music, Wesley-Smith is now a full-time composer and duck-farmer.