Except for voice [0], any fretless stringed instrument [1], any fretted string instrument with separate frets for sharps and flats [2], keyboard instruments tha

Except for voice [0], any fretless stringed instrument [1], any fretted string instrument with separate frets for sharps and flats [2], keyboard instruments that allow expression [3], keyboard instruments with split flat/sharp keys [4], and electronic instruments that allow unorthodox tunings without huge hassle [5]... I'm sure I'm missing some, but other than that you're totally right ;) [0] https://youtu.be/XnGqVIW51JA https://youtu.be/XnGqVIW51JA, https://youtu.be/mPZn4x3uOac https://youtu.be/mPZn4x3uOac [1] https://youtu.be/PqR36Drhn_k https://youtu.be/PqR36Drhn_k [2] https://youtu.be/iRsSjh5TTqI https://youtu.be/iRsSjh5TTqI [3] https://youtu.be/P14JcRyJCEI https://youtu.be/P14JcRyJCEI [4] https://youtu.be/7GhAuZH6phs https://youtu.be/7GhAuZH6phs [5] https://youtu.be/xVZy9GUeMqY https://youtu.be/xVZy9GUeMqY