Favorite male actor singing voices. And I'm limiting this to movies only, otherwise opera singers would take over.
1. Dean Martin
2. Hoagy Carmichael
3. Bing Crosby
4. Howard Keel
5. Gordon MacRae
6. Fred Astaire
7. Bobby Darin
8. Frank Sinatra
9. Bill Lee
10. Frankie Laine
Okay, sort of cheating on the last two. Bill Lee did the singing for John Kerr in South Pacific and Christopher Plummer in Sound of Music, and I love his voice so much, I have to count him here, even though I don't actually know what he looks like! I just love his voice.
Frankie Laine didn't do any acting that I'm aware of (?), but there are quite a few movies that he's sung the theme song for, where the movie would not be the same without his singing, so that puts him on this list for me.
Everyone else is pretty self-explanatory, I would think. Dino's been my favorite popular singer for ages, so naturally he tops the list, and I love his acting too. Hoagy Carmichael makes any movie he's in better just by being there. Now Frank Sinatra... I like his singing when he's young (like in Anchors Aweigh, etc.), but I honestly prefer him as an actor to a singer. I really enjoy his acting performances.
Runners up - any time an actor who is not a singer really sings in their movies. I'd rather hear Lee Marvin and Clint Eastwood sing any day of the week then listen to someone dub over them. I love Sean Connery's singing in Darby O'Gill and Dr. No. I love when George Raft and Gary Cooper sing in Souls at Sea. I don't really care if they're good or bad, I just love when actors knock out a few notes on their own.