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 * 🌐 **[Awesome Music Theory](https://github.com/vpavlenko/study-music)** - Music Theory Resources
 * 🌐 **[Music Outfitters](https://musicoutfitters.com/)** - Music Services / Information
 * ↪️ **[Sheet Music Sites](https://www.reddit.com/r/FREEMEDIAHECKYEAH/wiki/storage#wiki_sheet_music_sites)**
-* ⭐ **[Muted](https://muted.io/)**, [Teoria](https://www.teoria.com/index.php), [LightNote](https://www.lightnote.co/) or [Music Theory](https://www.musictheory.net/) - Music Theory
+* ⭐ **[Muted](https://muted.io/)**, **[Open Music Theory](https://viva.pressbooks.pub/openmusictheory/)**, [Teoria](https://www.teoria.com/index.php), [LightNote](https://www.lightnote.co/) or [Music Theory](https://www.musictheory.net/) - Music Theory
 * [Helio](https://helio.fm/) or [NoteHeads](https://noteheads.net/) - Music Composition Tools
 * [MusicKit](https://musickit.jull.dev/) or [Tone Generator](https://www.szynalski.com/tone-generator/) - Metronome, Tuner & Tone Generators 
 * [Tuner Ninja](https://tuner.ninja/) - Instrument Tuner