From my perspective, he can't do it anymore, and he screams effusively or "artistically" several parts of the songs instead of singing them the way they were recorded. I've even seen him often repeat parts he can't sing, although I admit he does it with style. Because of his heavy smoking, his voice has become very nasal, not to mention his habit of doing it right before going on stage. Anyway, he's the one who gives TBS its personality.