I've had good success using a mobile app which supports MIDI, the app displays random notes and I can play them on a keyboard. There's an immediate feedback loo

I've had good success using a mobile app which supports MIDI, the app displays random notes and I can play them on a keyboard. There's an immediate feedback loop which I think makes this type of learning very efficient. There are probably many apps like this, I went with https://play.google.com/store/apps/details?id=com.binaryguilt.completemusicreadingtrainer https://play.google.com/store/apps/details?id=com.binaryguil...