Free sheet music:
- [Musicnotes.com](https://www.musicnotes.com/sheetmusic/mtd.asp?ppn=MN0119492): Offers a free PDF download of the sheet music for River Flows In You.
- [IMSLP](https://imslp.org/wiki/River_Flows_in_You_(Yiruma)): Provides a free PDF download of the sheet music for River Flows In You.
Non-MP3 music download:
- [Yiruma's official website](http://www.yiruma.com/en/yiruma/discography/detail/11): Yiruma's website offers free downloads of some of his music in various formats, including MIDI and OGG. However, River Flows In You is not available for free download on this website.
Please note that the availability of free downloads may vary over time, so it's always best to check the respective websites for the most up-to-date information. Additionally, it's important to respect copyright laws and regulations when downloading music.