[zmmmmm]

> how to figure out finger numbering for sheet music that doesn't have finger numbering

It is one reason why instrumentalists spend so much time practicing things like scales and arpeggios. Because in practice 90% of music is made of these or small variations on them, so once these are "muscle memory" you truly don't think about fingerings any more.

[oplav]

I agree with this. Scales more or less have an accepted fingering so if you practice these a lot, you'll gain some natural muscle intuition for when you see variations on scales and arpeggios in the wild.

When I took classical piano lessons, each week we'd have a new key assignment and we'd have to practice scales, chords, and arpeggios in that key.

My piano teacher hand crafted a very nice sheet that listed all scale and arpeggio fingering for all keys, but that is buried somewhere in storage. This website [1] seems to have the same info.

[1] https://www.pianoscales.org/major.html