I like both kinds of music, Country and Western.

Seriously though, I don't use any criteria that I'm consciously aware of to evaluate songs, I either like them or I don't or I grow to like them (as long as they're not from barbershop quartets) but here are my answers:

How do you define "source singers"?
yes
accompanied
both
some
dance music and it depends on what you mean by "social or ritual".