Call numbers often appear to be strange to most library users. The Religion and Music areas are rather large but here are useful areas pertaining to church music. This can be useful also if you wish to browse the stacks.
BV301-530 Hymnology
BV360-465 Denominational and special types of hymnbooks in English
BV467-510 Hymns in languages other than English
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M1999-2199 Sacred vocal music
M2115-2146 Hymnals. Hymn collections
M2147-2188 Liturgy and ritual
M2190-2196 Sacred vocal music for children
M2198-2199 Popular religious and devotional music
ML3830-3840 Psychology
ML3919-3920 Moral influence of music. Therapeutic use of music
ML3921-3921.8 Religious aspects of music
MT3-5 History
MT90-146 Analysis and appreciation of musical works