I was gonna add Wetton, so I'm glad someone has! not sure about him as a person, tho I think he's mellowed latterly, but his voice..
& it turns up on so many things I like, together with that awesome bass of his.
Just to provide some balance I'll say John Payne too, Downes' erstwhile collaborator in Asia Mk 2 (or was it 3, 4, or 7?)
Phil Collins deserves a mention for his Hackett era Genesis stuff, tho I draw the line beyond '& then there were three.'
Gilmour, of course - has to be on the list..
I'll have to think about the other 5, because of course at No. 1, without question, in this unbiased poll of polls is 'our Jon'!!