lol tennismasta most of the songs I checked to see if they were on that site so they would be easy to get. I know the Tenshi na konamaiki ones are on there if you still haven't found them yet.

And the list continues..

You Get Burning [Matsuzawa Yumi] Nadesco opening
Overlap [Kimeru] Yugiou japanese opening
No Brand Heros [Shun kisaragi?] Here is greenwood closing {can find
here}
Poeny Pink [Maaya Sakamoto] Clamp Campus Detectives {can find here kinda 'cute' song so dunno if you would like}
Platinum [Maaya Sakamoto] CCS ending {from link above}
Yuzurenai Negai [Naomi Tamura] MKR opening [also from link above]
eXdream [myuji] X tv opening