Well, it pretty much depends on:
1) How you’re tuned
2) Which levers you have set (assuming a lever harp here)
If you’re trying to figure it out from sheet music, it depends on the sharps and flats in the key signature.
Generally speaking, if you’re tuned to a diatonic C scale (i.e., C to C, with no sharps or flats), you’re going to be in either the key of C major or or B minor.
Maybe this website will give you the information you seek.
>either the key of C major or or B minor.
I’m sure Audrey meant to type “A minor”.
Yep…should have been A minor.