Great vocalists I can think of right now.

1 Jimi Jamison(Survivor) No doubt about it.
2 Lou Grahm (Foreigner)
3 Mark Free
4 Tommy Heart(Fair Warning) He is like Jimi Jamison, Steve Perry combined.
5 Hugo
6 Kevin Chalfant(Two Fires)
7 Steve Perry
8 David Coverdale(Whitesnake)
9 Oliver Hardman(At Vance). He sounds a bit like Mike Reno.
10 Mike Reno(Loverboy)
11 Sammy Hager
12 Dave Baldwin(Departure)
13 Keith Slack(Steelhouse lane)

That's only a part of great men of voice...

Regards

Susumu