Top 3

[shinta|hikari]

1) Zutto kimi no soba de - Masuda Yuki
- I love the singer's voice paired with the music. The drum parts are also awesome. This is also my favorite anime song growing up, so that factors in making it number 1.

2) Kimi no shiranai monogatari - Supercell
- 1 and 3 both have really good ED animation. It is rare for me to be affected by visuals when picking music, but those two were good or relevant enough to me that it added a lot to the song. Still, having 2/3 be animation affected is still something. I don't even remember the ED animation sequence for this song, but it is still number 2. That's just how great it is.

3) Unity - Lisa Komine
- This is in because of sheer emotional impact. I can't believe how many times I've cried while listening to this, especially right after watching the better episodes of GOSICK. The ED animation also fit the lyrics so well, it felt almost lacking without it.

EDIT: Added in the comments. Sorry for forgetting.