Within the conservatorium, Crossin is founder and director of the Elder Conservatorium Chorale[REF] and the University's chamber choir Adelaide Voices.
Outside the conservatorium, he has worked as a choral conductor and clinician and over the past 30 years has conducted numerous choirs in Adelaide, including the Flinders University Choral Society, the Gilbert and Sullivan Society of South Australia,[REF][REF] Adelaide University Choral Society,[REF] Voiceworks and the Adelaide Symphony Chorus.