This is the one i like most ..

Lots of video tutorials
Indepth musical theory, combined with excersises..
Great collection of songs..

And you play everything from sheet music,..
Or by ear in other excersises..


Some things i noticed..
With the Yamaha fsr keys, i make much more mistakes then with the roland jupiter 80
The slightly smaller keys make me touch addescent keys,
Its barely audible but the app detects it..
It happens a lot on the yamaha but almost never on the Roland..


Also i noticed that i play slightly before the beat, espescially when i play chords..

All in all an interesting two days...


It convinced me that when the right app is choosen, its fun, and educational
And it really teaches music...
The apps however all come with a monthly fee..