Below are common class numbers for sacred music: solo songs and solo cantatas, vocal chamber works, hymns, liturgical works, and chant. Instrumental-only works, such as organ music that could be used in church services, are classed by the particular instrument.

Sacred solo songs and solo cantatas are classed in M2102 - M2114.8 (solo voice) or M2018 - M2019.5 (vocal ensemble). Sacred choruses and cantatas are classed in M2020 - M2101.5.

Hymns and hymn collections are located between M2115 and M2146.

Liturgical works and chant are classed in M2147 - M2188. These include masses, mass excerpts, requiems, communion services, Easter services, and other sacred works for service use, as well as traditional sacred chant from various religious organizations.