Seet began singing in the church choir at St. Peter's Anglican Church in Cobourg, Ontario at age 4 and started piano lessons at 5. At 13 years old, he played the carillon at St. Peter's for several years. When he was 15, he was recruited as the church organist and choir director at St. George's Church in Grafton and Trinity Anglican Church Colborne, Ontario for 3 years before leaving for university. During this period, he played viola in the Northumberland Symphony Orchestra and was the president of his high school band in Cobourg.