Music is an important part of the life of St Matthew's, both liturgically and through links forged with local educational, amateur and professional ensembles.

The Victoria Symphony was founded in 1941 by members of the Royal Canadian Navy as an amateur ensemble.

Under his stewardship, the amateur ensemble evolved into a professional orchestra.

Ballet exercises, as a training system, are also learned by the dancers from amateur ensembles who make up the rest of the company.

"It would be totally impossible for an amateur ensemble to cope with seven different repertories."

While an amateur ensemble does rehearsals to coordinate the rhythmic ensemble, rehearsals are also held for a number of other reasons.

For an amateur ensemble, the rehearsals are often used to give the players an opportunity to have repeated chances to play difficult passages.

Also included are grants to individual amateur ensembles who seek lessons from professional players.

Mostad's music has also been performed by local amateur ensembles.

He conducted amateur ensembles and was organist of the Union Chapel, Islington.