Archie fisher used to say that his vocal range was akin to a miner digging in a very small seam - and its a long time since I heard him sing in the clubs ,but his repertoir was marvellous -he hears and finds songs from all over the world on his travels. He also has a great radio show on radio scotland -Archie Fisher's travelling folk accessible through the BBC i player and is worth listening to ( I find it more interesting than the English folk progs but there again I've always been a fan )