Indispensable App for those who want to learn theory!

I think the best way to review this app is to paste a copy of the email I sent to the developers:

"Greetings and thank you for producing a very usable app that is managing to do for me what no music teacher could - understand music theory! Ive been on the cusp of understanding before but never managed to break through. Am I there yet? I dont know but one thing is for certain. I FINALLY understand the circle of 4ths & 5ths! I was able to "get it" going forward but it never made sense going around the circle in the other direction and no one has been able to explain it to me until this app! Seems ridiculous but that is the reality of it. I need to understand both sides of something to get it. Im sure the fault lies with me but that has been my learning dilemma. So needless to say your app has had a profound effect on my understanding of theory. btw, Ive been a musician for over 30 years. So a heart felt "thank you" and kudos for an excellent app!"

As you can read in my email this app has made it possible for me to go where no teacher could take me. It is very straight forward and very clear in its explanation. The theory sections have corresponding practice sessions so you can work the ideas into understanding. The language is concise with no waste or fluff. These folks know what they are doing! If you are interested in learning theory then you have come to the right place. It was for me, anyway!

Musecrafter1 about Music Theory by Musicopoulos, v2.6.1