*hymnology*

n. [ Gr. &unr_; hymn + -logy: cf. F. hymnologie. ] 1. The hymns or sacred lyrics composed by authors of a particular country or period; as, the hymnology of the eighteenth century; also, the collective body of hymns used by any particular church or religious body; as, the Anglican hymnology. [ 1913 Webster ]

2. A knowledge of hymns; a treatise on hymns. [ 1913 Webster ]