complete note conversion feature

[sugizo]

nice to have complete note conversion feature

e.g. note_scientific = C4 note_helmholtz = c' note = C octave = 4 frequency_integer = 262 frequency_float = 261.6 midi = 60

ref https://sugizo.pythonanywhere.com/music/master/pitch (for data gathered from wiki) https://en.wikipedia.org/wiki/Musical_note (for explaination)

if you interest, can share the API data for note above from the web (sugizo.pythonanywhere.com/music)

best regards

[craffel]

PR welcome!