Nusrat is amazing .. but a little nasal.. One of the best male singers i can think of (and largely forgotten) is Tim Buckley -- 5 and a half octave range, totally incredible! Listen to his album 'starsailor' (1970) to see what i mean.. tracks like 'monterey' make your blood run cold - Buckley could go up, down and in 6 other directions at once! robert plant doesn't come close!
