Always amazes me to hear people saying Bob Dylan or Tom Waits can't sing..
I say these people can't understand what singing means..
Singing is not about having an American Idol voice... its just about communicating through song..
These same people would probably say Billie Holiday couldn't sing or something...well plenty of people know that Billie, even in her later years, could "sing"..some, Miles Davis for example, would say her singing only got better as her voice declined..
You have to separate "singing" from "the voice".. now anybody can say they don't like Bob Dylan's "voice", but to say he can't sing?
There are plenty of examples of great singing from Dylan even in these twilight years and with that gargle voice he's got..... Nettie Moore from Modern Times for example is, yes, great singing.