Saw Robin Trower back in the early 1980's at a State Fair and he had a great tone and lots of cosmic notes and sustain.
James Deware who died I think a few years ago was a very good singer and bass player. *** Update. James died in 2002 of a stroke at age 59. He was born in Glasgow, Scotland. Being Robin Trower's vocalist and bass player brought him fame especially in Europe. Indeed I think he was a strong singer.