Hallelujah Oratorio Society (HOS), established in 1977, comes under the music direction of Rev Lee Chong Min, together with conductors Samuel King, John Zhang Tong and the HOS executive committee. HOS has five ministry groups under its wings. They are the Hallelujah Chorus, Hallelujah Singers, Hallelujah Gloria Chorale, Hallelujah Youth Choir and the Hallelujah Chamber Orchestra. Serving together are Christians who hail from various protestant churches in Singapore, the youngest being 11 years old.

HOS seeks to carry out its purpose, which is to “Promote Church Music to Glorify God and Edify Man” through various means, i.e. by raising the standard of church choirs and promoting engagement in church music through the performance of a wide range of Christian works, collaborating with churches on church music events and providing learning opportunities and resources.