Koi | en

There are multiple musicians named Koi:

1) A former punk band from San Jose, CA formed in late 2014.

2) Electronic producer Koi." Released "Maelstrom" and "Beginnings". http://collectivelanguage.bandcamp.com

3) Funkinspired band

4) Progressive rock band from Gothenburg, Sweden. Unsigned
They have a Myspace and an official site:
http://www.myspace.com/koichannel
http://www.koiband.net/

5) Steffen Bennemann aka Stalker, a techno producer from Germany, released an Ep under this name called Deaf Torero from Styrax Leaves in 2008.
For more information:
http://www.myspace.com/koispace
http://www.myspace.com/steffenbennemann
http://www.steffen-bennemann.com/

There is also a band named Koi in Groningen, The Netherlands that has two albums released so far.
More information: http://www.muziekvankoi.nl

There is a band from Western Massachusetts named Koi. They are a 4 piece band that combine a few genres.
http://www.myspace.com/koiband .