Hey there @fallonsteve291 I’m glad you’re enjoying the Bend it Better tool!
So just to clarify for anyone who doesn’t understand where this question is coming from, on the Bend it Better tool, in the upper left hand corner, second box from the top, if you click on the box it reveals the most common key harmonicas that people play.
In addition to the 12 common keys, there is also one higher key, and many lower keys, the most common of which are listed in the Bend It Better box for choosing the key harp you’re playing.
Here’s a thread about Sonny Boy Williamson’s employment of a Low D harp on the song Bye Bye Bird.
These are other keys made by Lee Oskar, Hohner Rocket line of harps, Seydel, and I think Suzuki makes some too. I wouldn’t worry about checking out the high G - the standard F harp is already a bit shrill for my taste!
But the Low tunings are really cool and worth checking out. I first dipped my toes into the Low tunings with a Low F because, as I mentioned above, the standard F is a bit shrill for my taste.
Hope that helps! LMK if you have any further questions on the topic. Also check out this post about the Seydel’s:
Rock on,
Luke