Hmm... Because of You by Kelly Clarkson reminds me of Astro and Tenma, so do some of her other songs. Anyway, I have quite a few:
Whisper by Evanescence
Road to Recovery, Tombstone (really makes you think about Astro) and Twenty Thousand Leagues by Midnight Juggernauts
Kryptonite by 3 Doors Down
Wonderwall by Oasis
The Door by Emmanuel Carella
A Winter's Dream by Symphony X
This Ain't a Scene, It's An Arms Race by Fall Out Boy
Spitfire and Action Radar by The Prodigy
This is How a Heart Breaks by Rob Thomas
Straight Lines by Silver Chair
and Hook Me Up by The Veronicas (
some of the lyrics and some of the music)