Dr. Lock founded the William Lock Singers and Orchestra in 1975, which grew to include 100 members and a semi-professional orchestra of 50 members. The group was renamed as the Musica Sacra Singers and they continued performing together until their last concert in 2011. Some highlights from his personal solo performing include performing the role of “Elijah” in three Malaysian cities, and performing the role of “St. Paul” at the commemoration of the 150th anniversary of Mendelssohn’s death.