Blue Moon - help pls!

[miss-newham.livejournal.com]

Can any of you help out my friend offensive_mango with her search for a certain version of 'Blue Moon'? She wants to know:

"Who did that version of "Blue Moon" that isn't the doo-wop version, but instead the soft, slow, romantic version that you sometimes get on the radio? It's definitely a male group rather than a male soloist (or indeed a female soloist).

Here are some people it definitely isn't:

The Marcels (too doo-wop)
Mel Torme (too non-traditional)
Elvis Presley (male soloist)
Sha-Na-Na (too jazzy/fast)
Frank Sinatra ((too jazzy/fast))
Nat King Cole (too jazzy/fast)
Ella Fitzgerald (too female)
Billie Holiday (too female)
Cowboy Junkies (too recent)
Showaddywaddy (too doo-wop)
Sam Cooke (too jazzy/fast)"

None of her friends list have come up with the right answer, but surely one of you knows...