Here is a video of me playing two A harmonicas through an amp. One is tuned to pure Just intonation, the other one is much closer to equal temperament. I wrote an article on this topic that goes into a lot more detail and if you click on this sentence you can read the article.

I also “just” made a movie with a goofy title (it’s a tech thing) Click on the following to see the video:

just & equal in 4 minutes-iPhone

It may take a while to load, because the sound files are large to keep the quality up. This makes it easier to hear what I am talking about.

I focused on playing things that show plainly the biggest differences between just intonation and equal temperament harmonicas.

It shows why a harmonica tuned to pure just intonation can be a great secret weapon for amplified harp. Sneak this effect into your blues playing and you will have people scratching their heads and harp players who aren’t hip to this wondering what you are doing and why they can’t sound like you.