xi (pronounce: sai), stage name of Yusuke Ishiwata (July 5, 1988), is a Japanese musician, very popular for composing music for rhythm games.
| Game | Song | Year | Album |
|---|---|---|---|
| Cytus | Halcyon | 2012 | Parousia |
| Parousia | Parousia | ||
| Zauberkugel | 2013 | Agartha | |
| Niflheimr | Agartha | ||
| Revoluxionist | Cytus: Official Soundtrack | ||
| Freedom Dive | 2014 | Parousia | |
| Storia (vs. Sakuzyo) | 2015 | Cytus: Official Soudtrack | |
| SOUND VOLTEX IV HEAVENLY HAVEN | Freedom Dive | 2018 | Parousia |
| Chrono Circle | Aragami | 2021 | World Fragments |
| Taiko no Tatsujin: Rhythm Festival | Freedom Dive↓ | 2022 | Parousia |
| Chrono Circle | MEGALØDON | 2022 | N/A |
| Halcyon | Parousia | ||
| Freedom Dive | 2023 | Parousia | |
| Qualia Crystal | N/A | ||
| Pump It Up Phoenix | Halcyon | 2023 | Parousia |
| Pump It Up Phoenix (version 1.04.0+) | Aragami | 2023 | World Fragments |
| Pump It Up Phoenix (version 1.08.0+) | PRiMA MATERiA | 2024 | N/A |