AwSnap, you have totally harshed my buzz...!
How I love female vocalists, and hate "girly" singers (of either gender):
James Blunt - more like a knife wound deep into the liver than fingernails on chalkboard.
Whoever sings "Halo" (I sing along with that, "I can see your A-hole..."), which my SO has burned onto CD and therefore into my very soul (and not in a good way).
"Umbrella" - oh God, another repeated syllable ad nauseum tune. No matter who does it.
"Toxic" - is that Britney Spears? At least I can understand artistically where the other tunes want to go (I just despise that place) - but this one...WTF?
I'd have a longer list, but my car radio is tuned to NPR so I only hear any of it when I'm in someone else's car.
I actually love some of the songs nominated for eternal burning on this thread, but I'll enjoy them in the privacy of my own head out of respect for youse all.