Hi. I've been really pleasantly surprised by the content of this site.
Appreciate it!
Here is a link to a very good article about "Cycle diagrams" and the "Giant Steps" progression by Dan Adler.
It's about mathematical principles that lie within music. The tritone is also discussed a bit.
You may know the cycle of 5ths...there are more useful cycles...curious?!...check it out.
Dan Adler is a guitarist, but I find this article useful for keys-players as well.
Greets,
rishi111