Must mention Geoff Muldaur, subject of a recent Mudcat thread -- *if* he fits the definition of "folksinger," which is problematic.

Anyone remember Tom Rush? Not much of a songwriter, but a great vocal interpreter of the early folk-revivial era, and a pioneer in erasing the artificial line between folk and pop. His eponymous first album is notable for including tunes by Chuck Berry and Bo Diddly as well as Bukka White, Robert Johnson, and "trad.," all of them given the same respect and perfomed with the same spare instrumentation. I had thought Rush was retired and long-gone, but recently learned that he's still performing in the New England area; and, of course, he has a website that you can check out if you wish.

Folk has to include blues, but all the best blues singers clearly cross the boundary between "folk" music and pop/rock/"commercial" fare.

The male singers I most admire, and wish I could emulate, include Tony Bennet, Al Green, the late great Johnny Adams, and any number of others, few of whom could reasonably be categorized as folk.

Mose Allison, maybe?

Best male singer among blues revivalists? Son House protege and former New Orleanian John Mooney. (A hell of a slide guitar player, too.) Best male vocal ensemble? The recently reunited Subdudes, who just this afternoon preceded, duly impressed, and essentially upstaged Messrs. Crosby, Stills and Nash on the big stage at the New Orleans Jazz Fest.