I think as stated near the start of this thread, we can all think of crap songs by crap artists, but what might be more interesting is a list of crap songs by (otherwise) good artists. For example, the Beatles are widely regarded as the greatest pop group ever (or similar hyperbole) and they undoubtedly made some classic pop records - but they were also responsible for some garbage. How about Revolution No. 9, or Why Don't We Do It In The Road? Or Everybody's Got Something To Hide Except Me and My Monkey?

And Elvis churned out a fair amount of pop pap in his time, especially a lot of the stuff from his movies, which were just dashed off as album fillers.

And as ever, this is all subjective. One man's crap song is another's classic. And, to add to the confusion, some songs are so bad they're good!