Sealm-sang

According to the Old English Dictionary:

sealm-sang

II. add: a service at which psalms are sung, one of the seven canonical hours :-- Sealmsonge sinaxis (cf. Professus sum monachus, et psallo omni die septem synaxes cum fratribus, Coll. M. 18, 31), Hpt. 33, 239, 18. Gebróþrum sealmsange (psalmodie) underþeóddum, Angl. xiii. 391, 376. Man gehýrde mycelne sealmsang coepit psalmodiae cantus audiri, Gr. D. 238, 29. Sealmsangum (psalmodiis) onþeówigende, Angl. xiii. 375, 130: 373, 116. sealm-sang