Slow Burn - Atreyu: Theme for book 30, Marco and his mom (The opening piano part is the same as the music that played when Visser One was introduced in the TV show).
Zombie - The Cranberries: Controllers, "What's in your head?"
Name - Goo Goo Dolls: Rachel and Tobias dance in book 33
Tubthumping - Chumbawumba: The Animorphs' philosophy, "I get knocked down, but I get up again."
My Skin - Natalie Merchant: More Rachel and Tobias
Bound - Disturbed: Theme for book 48, Crayak and Rachel
Through the Fire and the Flames - Dragonforce: Theme for book 51, the escape with the governor
10th Man Down - Nightwish: Theme for book 52, the bombing of the Yeerk Pool
A Sequel of Decay - Tristania: Ending of book 52, the Blade ship appears
Our Solemn Hour - Within Temptation: Theme for book 53, the infiltration of the Pool ship
Nemo - Nightwish: Rachel and Tom's final battle
Sleeping Sun - Nightwish: The Ellimist appears before Rachel
Deep Silent Complete - Nightwish: Rachel's funeral
Dead Boy's Poem - Nightwish: Marco, Cassie, and Ax, force the depressed Jake to morph dolphin
Amaranth - Nightwish: Ram the Blade ship
The end of the series deserves a lot of Nightwish.