Another 10 suggestions from my top 50. *Same as the previous suggestions, beneath the videos are the links to the real person behind the music except for the 2nd suggestion didn't find the real person's live music*
0) Hoshizora No Believe by Mami Ayukawa from Gundam Zeta Ending Theme 1985
1) Tenshi No Yubikiri by Mai Fukuda from Kare Kano Opening 1998
2) Sakura Saku by Megumi Hayashibara from Love Hina Opening 2000
3) Sakura Saku Mirai Koiyume by Yozuca from Da Capo opening 2003
4) My Pace Daiou by Manzo from Genshiken Opening 1 2004
5) Innocent Starter by Nana Mizuki from Magical Girl Lyrical Nanoha Opening theme 2004
6) 88 by LM.C from Katekyo Hitman Reborn Opening 4 2006
7) Donten by Does from Gintama opening no.5, full version episode 105 ending 2006
*Youtube removed the 3m viewed version*
8) Modokashi Sekai No Uede by Makino Yui from Welcome To The NHK Ending no.2 2006
9) Paradise Lost by Chihara Minori from Ga-Rei Zero opening theme 2008