We actually just saw Ring of Fire since we both are Cash fans. The show was so so. There is just something not right about a bunch of gays singing Johhny Cash in chorus.
"Big River", my favorite song, sounded terrible.
I saw the gay men's chorus a couple of times. They weren't bad, but they are a chorus. I imagine the Cash songs are particularly ill-suited (along with most country/western)for a chorus since they are mostly highly personal songs.