Favorite male musicians who sing

On February 16, 2008, I wrote a blog entry about my favorite female vocalists. Since then, I added a few names to what I originally posted, but it has basically stayed the same. But who are my favorite male vocalists? I certainly have favorite male performers, but is it their vocal style that I like, or what they do with instruments, or the songs they choose? So in some cases I'm not sure to what extent it's because of their vocal style, but my favorite male musicians who sing include:

Folk:
Tao Rodriguez Seeger
Dan Berggren
Joe Crookston
Eric Andersen
Tom Rhoads
Tom Paxton
Bill Staines

Mainstream:
Elvis Presley
Robin Gibb and Barry Gibb, when not falsetto
Adam Lambert

Another thing I found was that when I made the list of female vocalists, it was easier to decide who to include and who not to include. With the male musicians who sing, there are many that I like somewhat, rather than a few who stand out especially.

And while in general I can't rank them, and the order in which I listed them is random, Tao Rodriguez Seeger is definitely number one.