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| Key | Song | Notes | Artist |
|---|---|---|---|
| 27595 | Chiksilog | Kamikazee | |
| 42198 | COLORFUL (カラフル) | Dragon Zakura OST | Tomohisa Yamashita |
| 42294 | COLORS | Code Geass OP1 | FLOW |
| 41588 | COLORS | Hikaru Utada | |
| 42533 | Colors of the Heart | Blood+ OP3 | UVERworld |
| 42985 | Come Back To Me | Hikaru Utada | |
| 21143 | Come Together | The Beatles | |
| 25525 | Complicated | Avril Lavigne | |
| 42381 | COPPELIA no Hitsugi (コッペリアの柩) | Noir OP | ALI PROJECT |
| 42698 | COSMIC LOVE | Rosario to Vampire OP | Nana Mizuki |
| 41369 | Crazy About You | Luna Sea | |
| 25801 | Crazy in Love | Beyoncé feat. Jay Z | |
| 43107 | Crazy Moon ~Kimi wa Muteki~ (Crazy Moon～キミ・ハ・ムテキ～) | Arashi | |
| 8270 | Creep | Radiohead | |
| 43252 | Crow Song | Angel Beats Insert Song (marina vocals) | Girls Dead Monster |
| 25400 | Cry | Mandy Moore | |
| 40309 | CRY NO MORE | Blood+ ED2 | Mika Nakashima |
| 41233 | Cube | Gackt |