| Title | Singer | Writer | Album |
|---|---|---|---|
| Kokoro (Heart) | Joanne Hogg | Yasunori Mitsuda, Tetsuya Takahashi | Xenosaga OST |
| Pain | Joanne Hogg | Yasunori Mitsuda, Tetsuya Takahashi | Xenosaga OST |
| Small Two of Pieces (english) | Joanne Hogg | Yasunori Mitsuda, Masato Kato | Xenogear OST |
| Stars of Tears (english) | Joanne Hogg | Yasunori Mitsuda, Masato Kato | Xenogear OST |