Ok, let's try to start a meme.
Write down the worst songs of the artists in your top 10 along with some explanation. "But they don't have any!" is not a valid answer. No artist is flawless. I'm sure I'll be hard pressed to find some, but let's go for it...
1. Pink Floyd
There are surprisingly many, considering that they are my absolute favourite band in the known world and they have made some of the most celestial music ever recorded (Celestial Voices, anyone?). Most of them are vague attempts at upbeat pop songs, such as Summer '68
(although I love the "a drink-a drink - a drink-a-drink", mind the spacing), but the trophy here goes to One Slip
off of Momentary Lapse of Reason
Not because it's a bad song, as such. It's upbeat, sure. Fine, it's a Gilmour solo number. But it has none of the qualities which could make it a classic Floyd number. It's pretty forgettable, and that's not what a Pink Floyd song should ever be.
2. Porcupine Tree