no no no NO paul simon really really really can sing, listen to 'american tune' or any of 'still crazy...' and you won't tell me otherwise
i'll tell you who really can't sing and that's Al Stewart [tumbleweed]
an awful lot of pop singers have very constrained voices IMO, like Freddy Mercury, they get stuck into their own vocal tics too much. imo stevie wonder is a bit guilty of this, but of course he's a genius singer - i remember 'lives of the great songs' describing 'sunshine of my life' as 'the standard nobody else can sing'. and listening to early michael jackson now is just tragic, his voice is so lovely to listen to before he started fiddling with it.
roger daltrey can sing
and bruce dickinson from iron maiden
and paul weller, yes
and sophie ellis-bextor
and paul mccartney
and emma kirkby - and bryn terfel - and...