Biography
There are at least 4 artists with this name.
1) is an electronic brony musician and singer. https://twitter.com/koapony
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2) is a Spanish electro producer.
3) is a Hawaiian pop-rock band led by Koa Siu.
4) is a Czech folk band. The band for first formed around Zuzana Navarová d.T. and after her tragic death continued to perform with new repertior.
Biography text from Last.fm, available under CC BY-SA.