Opening Credits:
"Xepher" - Don't know the singer
Epic starting song. that. :O

Waking Up:
"The Song That Goes Like This" - Spamalot

Falling in Love:
"Winter Sleep" - OLIVIA
What a depressing falling in love song. o_o

Fight scene:
"Release my Heart" - Again, don't know the singer D:

Breaking up:
"Gravity" - Vienna Teng
How almost appropriate for break-up.

Getting back together:
"Dearest" - Ayumi Hamasaki

Secret Love:
"Run, Wolf Warrior" - Yoko Kanno

Life's okay:
"Green Finch and Linnet Bird" - Sweeney Todd

Mental breakdown:
"La Nostra Forza" - Daniela Renaldo or Elena Tavernini

Driving:
"One Short Day" - Wicked
That actually makes sense!

Flashback:
"Finale B" - RENT
Ah! It works so well! <3

Partying:
"Stick it to Dolores" - Harry and the Potters

Happy dance:
"Hideaway" - The Corrs
Not a happy dance song. D:

Regretting:
"I Don't Feel so Well" - Vienna Teng

Long night alone:
"Sixteen Going on Seventeen" - The Sound of Music
...WHAT? D:

Death scene:
"Hips Don't Lie" - Shakira
El. Oh. El.

Ending credits:
"Canfidence for Quiet" - The Corrs