I just added these today; the single and the album that contains the ending theme of Chaos;Head anime :3
First Sight (Seira Kagami):
http://vgmdb.net/album/47937
http://vgmdb.net/album/47936
Celebration (Seira Kagami):
http://vgmdb.net/album/47938
http://vgmdb.net/album/47939