Top 5 songs that have left an impression on me.

These songs do not necessarily have to be good. However, they will always remain in my head because they suit the atmosphere so well when I heard them or if they were just so unexpected.

#5 You're the Inspiration - Chicago (from Elite Beat Agents)
The very song that drove me to EBA. Not only was it a beautiful song, in EBA, it gave me an absolutely simple, yet touching scene that blended the atmosphere and the song so well. To this day, "You're the Inspiration" remains as the best of all the oldies I've heard.

#4 White Tiger - Nobuyuki Hiyama (Disgaea 2: Cursed Memories)
To explain this would take a long time, so I'll simplify it as much as I can. This is the BGM for your final showdown with Axel the Dark Hero. Axel used to be a famous idol known as the Dark Hero. However, his fame dropped one day. It dropped so low that everyone thought he was dead, even his family. And when he announces to the world that he's not dead, nobody believed and called him an imposter, once again including his family (especially his mom). Since then, he was willing to do anything just to regain his fame, including acts of kindness (which is not something a Dark Hero usually does). You face him a number of times in the game and easily clobber him flat. He was so pathetic that his best friend (his manager) said, "You are no longer the Dark Hero I once knew." Finally, Axel realises this and challenges the main characters one last time. The moment the battle started, this music plays. At that moment, I somehow knew that Axel is no longer the wimpy moron I've faced so many times. And I was right, he gains cool new attacks, which mostly involves guitar solos and his sword. It felt like he was the one playing the song as he fought us. Even after he lost, he was still cool. The Dark Hero had returned.

Damn that was long. And that's the shortened version. The full story would make him sound even cooler.

#3 One Winged Angel - Nobuo Uematsu (FFVII, Kingdom Hearts, Kingdom Hearts 2)
I believe I've explained this before. One-Winged Angel accompanies you through as you battle the greatest villain in video game history, in three different games! After having my ass handed to me on a silver platter so many times, I've learned, or rather, it has become my instinct, to despair when I hear this song being played as I play any video game, even if it is just ITunes playing while I play Maplestory.

#2 A Song of Storm and Fire - Yuki Kajiura (Tsubasa Chronicles)
How shall I put this? Well, first, I do admit that the characters in TC lack emotion, especially in the anime. Either the art was done poorly, or the characters had something to hide (which is true for almost all of them if you follow the manga). Then, comes A Song of Storm and Fire as well as a whole OST of Yuki Kajiura's works and the emotions have been filled. Although it is mainly melancholy, I can feel Shaoran's strong will, Kurogane's absolute power and determination, Fye's hidden sadness and secrets, and Sakura's struggle. No OST has ever given me a better impression than Tsubasa Chronicles's. I picked A Song of Storm and Fire because I can feel the most from it.

#1 Cha La Head Cha La (Lucky Star version) - Aya Hirano (Lucky Star)
Tell me you did not expect this. Well, I guess some people would have. Anyway, I've never paid attention to any of the Dragon Ball songs until this one came. There are several reasons that this song has left a very deep impression in me.

1. It sounds like what a lot of people sound like when they go karaoke and decide to act like idiots (in a good way)
2. From 2:22, that is possibly the best part of the song. Rather than singing, Konata has started to just plain shout.
3. It's unique that it sounds so nice considering how it was sung.
4. Konata sang this. (joking)

I'd list a few more like Aletheia (BGM for final operation in Trauma Centre 2), Otherworld (FFX) and Coite- Bodher Battlefield (.hack//G.U.), but I can't really rank them here.