I think the default answer is Evanescence Bring Me to Life because every AMV has this song. Ah the mid to late 2000's.
Pretty much. If people weren't using Darude - Sandstorm for anything, they were playing this...
Anyways, I've actually been meaning to create a thread dealing with an eerily similar subject where every character had a sort of theme song attached to them that wasn't specifically made for and used in the Kingdom Hearts games. I held off on that since I didn't really have too many songs that I felt I could use properly (and most of the music that I tend to listen to these days range from film/game/anime OST's to rock and metal). They may not always necessarily reflect the characters' personalities or situations, but I do tend to think of them when listening to these songs. Still, I managed to find a fair few that could work:
Sora:
"Birth by Sleep" by I Am King
Riku: "Chain
of Memories" by I Am King; alternatively, there's
"Waking the Demon" by Bullet For My Valentine
Axel/Lea:
"Fire It Up" by Thousand Foot Krutch; alternatively, there's
"This Fire" by Killswitch Engage
Terra:
"Throes of Perdition" by Trivium; alternatively, there's
"Forsake Not the Dream" by the same band and
"Your Betrayal" by Bullet For My Valentine"
Master Eraqus:
"Torn" by Disturbed; alternatively, there's
"No Quarter" by Led Zeppelin
Vexen/Even:
"Cold As Ice" by Foreigner
Ansem the Wise:
"Time in a Bottle" by Jim Croce
EVERYONE in Birth by Sleep:
"Communication Breakdown" by Led Zeppelin
Roxas:
"Numb/Encore" by Linkin Park (seriously, there were TONS of Kingdom Hearts AMV's with their songs during that time, too)
Zack Fair:
"Young Lust" by Pink Floyd
Cloud Strife:
"Hey You" by Pink Floyd; alternatively, there's
"Strife" by Trivium
Kairi:
"Message in a Bottle" by The Police (used ironically here since she's sending a message to someone who would eventually need help)
The members of Organization XIII that were in one Master Xehanort's plan as laid out in Dream Drop Distance:
"Fake It" by Seether; alternatively, there is
"Like Light to Flies" by Trivium (it mostly deals with a different issue altogether, but it can still apply, I think)
Aqua:
"Don't Stop Believing" by Journey
Ventus:
"Goofy Gooby Rock" from the Spongebob Squarepants Movie
Young Master Xehanort and Braig/Xigbar:
"Never Gonna Give You Up" by Rick Astley (because we all know these guys are such massive trolls)
Master Xehanort:
"Master of Puppets" by Metallica (seriously, is this one even surprising)
Anyone that abuses the Darkness only for it to consume them instead:
"The Hand That Feeds" by Nine Inch Nails
And that's all I got at the moment...