https://www.hoffmanacademy.com/blog/the-circle-of-fifths-piano-tutorial/
https://www.londonpianoinstitute.co.uk/the-piano-has-only-12-keys-7-white-notes-and-5-black-notes/
https://www.pianote.com/blog/intro-to-modes/
https://www.tonegym.co/blog/item?id=extended-chords
https://www.academia.edu/4380524/Manual_of_Scales_Arpeggios_Broken_Chords_piano_The_Associated_Board_of_the_Royal_Schools_of_Music