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There are at least 10 groups with the name H2O (including H₂O):
1. A hardcore band from the United States
2. A pop rock band from Latvia
3. A hip hop duo from South Africa
4. An alias of Oliver Strumm
5. A rock band from Scotland
6. A hip-hop/dance group from Montenegro
7. A techno act from Norway
8. A progressive rock band from Italy
9. H2O was a Japanese folk/pop duo from Nagano Prefecture: Kenji Nakazawa(中沢賢司） and Masaki Akashio(赤塩正樹). Read more on Last.fm
