So is pop music depressing, as I'd asked here? Dave Barry's 'Bad Song Survey' might help you decide.
My vote for the worst song of all time is 'Train in Vain' by The Clash, but I'm not sure if meets his criterion that "a song had to be known well enough that a lot of people could hate it." I'm also not entirely sure that it's worse than his winner, which is truly laugh-out-loud hideous - and there's a lot of dross that winner had to beat off, including unsurprisingly the Billy Ray Cyrus virus.
Dave Barry's Lifetime Bad Achievement awards are also well considered. Elton John tops that poll for me, but that's just an old punk talking.
Dr Sally Jo Cunningham has embarked on a New Zealand survey of what people hate about songs "as part of research on music information retrieval." Story here.