Sakurasou no Pet na Kanojo OPII:
https://www.youtube.com/watch?v=_5Rq-231HrQ
I just love it, I could listen to it the whole Day! :D
Sword Art Online II OPII:
https://www.youtube.com/watch?v=aR_r-MqEwXo
I just love the whole SAO Theme (the Sakurasou Theme, 2!), this is one of my Favorite Openings.. ^^
I have more Favorites, but there aren't Vids on YouTube anymore..:
Fate/Zero - Oath Sign
SankaRea - Opening
GoSick - Destine Histoire
and many many Endings.. :'D
Edit: Well, I would like 2 embed this 2 Links, but I'm just bad... :'D