Smith's output of liturgical music includes settings of the Psalms for the three-year liturgical cycle of Masses, several settings of the Ordinary of the Mass, two collections of hymns, and other sacred works including a choral arrangement of O God, our help in ages past.[3] Arguably Colin's signature work is the Mass Shalom, originally composed in 1977 and one of the only Australian Mass settings popular before the revision of the English translation of the Mass to be reworked for the 2010 translation.[4] As Colin had died some five years earlier, the revisions were the work of Paul Mason.[5]
He was also the director of the John Paul Singers, a Catholic sacred choir formed for the Papal Visit of Pope John Paul II, until May 2005, shortly before his death, when he handed the baton to Donrita Reefman, who in turn passed on the baton to Julie Spencer in September 2014.[3][6]