There are multiple artists called XI:
1) Xi is the name of a doujin artist from the circle AQUAELIE that makes metal arranges of touhou music.
2) xi (Yusuke Ishiwata) is a Japanese music producer known for his BEMANI Simulation Files (BMS) and for his appearances in Rayark Games' rhythm series Cytus, which made him quite popular. He has been a member of the 100sec Records label until March 31st, 2014 and often appears in Diverse System compilations.
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