I disagree quite a bit with you. I once heard an old recording of Ledbelly talking and couldn't understand a single word. Peggy Seeger still has a noticeable American accent, but probably due to Ewan McColl being very against American Folk she tended to sound much like him a lot of the time. Heaven forbid olk Hank had sang Raglan Road! not too many Irish singers sing it well. but I have heard a rare recording of him doing a folk song that had a distinctly trad English sound to it and you'd never have guessed it was Hank Singing. I'm not suggesting Hugh Laurie is much of a singer but hearing him murder the blues in a recent docu it was in a distinct if un convincing U.S accent that pretty much all white British Blues singers adopt. And most likely because the way Blues and Country Lyrics are written most voices will sound more american. As will most non Irish voices sound Irish if they sing Trad Irish songs. After all if you want to speak French or German and want to do it well then you have to sound a little French or German. By the way I think Pete Seeger does indeed sound like he's singing in his own voice, but because he has an American accent and does mainly American Folk. But you don't say just who are all these great voices who you say don't sing in accents?