Chords and fingerings of different musical instruments are also listed to help you practice them. Some musical instrument related tools, such as Synthesizer, Metronome, Tempo meter, Tuner and Pitch detector, are provided here too. Open Music Theory (https://github.com/openmusictheory/openmusictheory.github.io) is a public domain, interactive, online text book for college-level music theory courses. To make it easy to access without internet, it is integrated here.