There are multiple artists named River:

1) River is a band founded by Ant Balci, leader and founder guitarist of the Turkish death metal band In spite, in 2006. River is also a debut album by Ant Balci, who has no financial purpose, therefore has distributed his song over internet.
http://www.river-project.com/tr/

2) River is a Cascadian folk band from Oregon and Washington, USA, formed by Nate Myers (Leech, Mania, Vault Dweller), Dylan Bloom (Huldrekall, Wake) and Michael Korchonnoff (Alda, Novemthree, Satus).

3) River is a Japanese Vocaloid producer whose known for his album "Rhythm Symphony".

4) River is a Southeast London-based artist who was discovered after her rendition of Ashanti’s “Foolish. She is most known for her feature in Tobtok’s cover of “Fast Car”.

5) River is a Hip Hop artist that started in 2020 and is most known for his song "No Answers" on his 3rd mixtape called "Somewhere On Earth 2".