Final answer:
The 5-letter word for a group that sings exalting music is 'choir,' which is often associated with singing in a religious or sacred context.
Step-by-step explanation:
The 5-letter word for a group that sings exalting music, like the Bulgarian women's one heard in "Brother Bear," is choir. A choir typically refers to a group of singers who perform together, often in a church setting or during religious services. This term fits the context of the given lines which suggest a sacred and communal aspect of singing. The other options provided: Quart (which is likely a typo for quartet), Octet, and Ensemble are also groups of musicians but do not specifically align with the 5-letter word criteria or necessarily imply the sacred context.