I'm Learning the Diminished Scale 

Ha ha. I can barely play the harmonica but at least I'm honest about it.
Marco Cabrera does a lesson on the same topic : • Chromatic Harmonica Le...
I have streaming harmonica courses available on my site: chromaticlesso...
NEW in 2024: Join my new chromatic practice club on Discord. Weekly lessons at an easy pace! whop.com/chrom...