I have an other option, but i strongly suggest you to choose an option from the poll.

From those, Seven Nation Army.

I think Poker Face...

From that list, Umbrella

Hey Ya!

But if you vote other, please state which song you think deserves it.

Umbrella

Clocks by Coldplay and Hey Ya! by Outkast.

Toxic

That list is such a poor representation of songs that have defined the noughties! I mean what kinda underwhelming tracks are these?!

ugh

What songs would be good?

I Got A Feeling for the win

You shouldn't have even put a Other option

Anyway, this is a tough choice between CIL, 99 Problems or Hey Ya!

I think Imma go with 99 Problems since it has the most recognizable chorus than any song released in the 2000s.

Every single person knows "I got 99 problems but a bitch ain't one"

That's why I chose it. Not even a top 20 hit and more iconic than all #1 that year.

Seven Nation Army.

I think that, out of those, Paper Planes is the song that represents better the spirit of the noughties. I don't think it "defines" it though.

Hey Ya!, Crazy In Love, and Since U Been Gone.

Seven Nation Army, it is also the best song from that list.

I think it needs to be a song that plays around with its genre or is musically different/daring

so any of the following really:

Girls Aloud - Biology
Eminem ft. Dido - Stan
All Saints - Pure Shores
P!nk - Just Like A Pill
Leona Lewis - Bleeding Love
Duffy - Mercy
Kylie Minogue - Can't Get You Outta My Head
Coldplay - Yellow
Christina Aguilera - Beautiful
The Black Eyed Peas - Where Is The Love?

Looking back on your list actually... I'd accept Beyonce, Gnarls Barkley, Amy Winehouse, Rihanna haha!