I think Richie Kotzen has a very versatile vocal range. Although not recognised in main stream because the industry doesn't promote him he can sound like Rod Stewart gravelly all the way to Terrence Trent Darby or Dio hitting high clear notes and sustaining them. He's constantly compared to Chris Cornell although that's mostly by people who listen with their eyes. His voice is more powerful, versatile and consistently solid than Cornell's. Top that off with the fact that he's a killer guitar player, multi instrumentalist and songwriter and it makes him hard to beat. Some of his 24 plus albums have been written and recorded by him alone with him playing all instruments and vocals..