I just watched an interview on YouTube with Charlie Musslewight ( please correct me if the spelling is wrong) someone whose playing I’ve admired for years. Anyway he was talking about position playing, and how he stumbled on it, one night he saw Shakey Jake sitting in with someone and he noticed he’d got a D harp and a C harp and the band was playing in A, so after the set he went up and asked Jake about it as he’d never come across it, later on that Evening he bumped into Little Walter and he told Walter what he’d seen Jake do, Walter said yeah you can also play and E harp with A. So curious I put on a backing tracks in A and started figuring it out and by Jove I think I have it. Anyone else out there experimenting with position playing, I would love to know your thoughts and Ideas on the subject perhaps even some of the keys and the harps you use. Thanks
Hi Andy @Andy2
This really is easy to “discover” by using either tables or the “Circle of 5ths” or even smartphone apps. Here is a table that shows which harp key you can (theoretically) use to play a song that is in a particular key. I say “theoretically” because for some combinations of song key and harp key you need to be able to do some really difficult things (overblows, and/or overdraws) that you might not have mastered or your harp is not set up to enable you to do them no matter what your skill-level might be.
If you cannot figure out how to use this chart, then ask here and either I or someone else here will explain its use to you. I guess I should add that the “easy” positions are: 1st, 2nd, 3rd, 4th, 5th and 12th.
I will let you find pictures for the “Circle of 5ths” and apps for your smartphone.
Regards,
– Slim 
Hi Slim I have a circle of fifths for guitar but thanks for this I can at least have some fun experimenting