From the Wikipedia article: Ending: "Mirai to Yuu na no Kotae" by angela
Lee Jinki. :3
Onew (Lee Jinki) from SHINee
The ending theme song is Asunaro Ginga by Sonim.
Ending Theme:"Tsuki Akari" by Dohatsuten
Ending Theme:"Yokan" by heidi.
Ending Theme: #1: "still doll" by Kanon Wakeshima
Just Fall in Love
Thats probably the fifth or sixth ending theme, search for it on youtube; the description should give you its real name
Opening theme is called 'Karma', ending theme called 'Bouken Suisei'. But in any case should you be asking about the song that Tear sings, it is known as ''Tear's fonic hymn'
Ending Theme:"Sarabai! (See You Adieu!)" by Tomoko Kaneda
Go to Ear-tweak.com and select 'The Music' to see all the opening and ending theme songs used in the show. (If you look closely enough during the credits [somewhere in the beginning I guess] you should see Ending Theme and underneath it will be the name of the song playing).
Ending Theme:#1: "Yasashii gogo" by Minawo (eps 1-12)#2: "Hajimari no hi" by Minawo (eps 13-23,25)#3: "Caged Bird" by Shunichi Miyamoto (ep 24)#4: "Michishirube" by Shunichi Miyamoto (ep 26)