I did this once, quite a bit ago. But my tastes have differed since then.
Opening Credits:
Waking Up: "Sporadic" Faye Wong [this is the most gorgeous song ever 
]
Falling In Love: "LOVE LOVE LOVE" DREAMS COME TRUE [a bit sappy, but what can I say, I'm a sucker for this beautiful ballad]
Fight Scene: "One More Time" Daft Punk
Ultimate Betrayal: "Oceania" Bjork [a bit deep and provoking, but the more I think about it, the more it has a betrayal feel to it]
Breaking Up: "F××k You And Your Money" MiChi
Make-up: "Lately" Stefani Vara
Secret Love: "MAKE LOVE" MEG
Life's Okay: "love the island" Ami Suzuki [YES!]
Happy Dance: "more more more" capsule
Wish You'd Lived: "The Dope Show" Marilyn Manson
Driving: "HOUSE NATION feat. LISA" ravex [this scene has to be at night and the music has to be EXTREMELY loud]
Mental Breakdown: "Obsessed" BoA [lol]
Regretting: "Major Tom" Shiny Toy Guns [YES!]
Flashbacks: "Waiting" Madonna
Long Night Alone: "Starstruck" Santigold
Reality Check: "Sunshowers" M.I.A.
Turning Point: "Hate tell a lie" Tomomi Kahala
Final Battle Begins: "DEGENERATE" globe [*unce unce unce* lol]
You're Losing the Battle: "The 15th" Fischerspooner
Turn the Tables: "That's Not My Name" The Ting Tings
Victory: "Sexy" hitomi [don't ask lol]
Death Scene: "Come" Namie Amuro
Final Ending: "Lights" Eri Nobuchika
Credits: "Chick Habit" April March