I recommend "Notes Trainer" app for the iOS, it can connect to a digital piano over bluetooth or USB and then you can practice recognizing notes. On the upside

I recommend "Notes Trainer" app for the iOS, it can connect to a digital piano over bluetooth or USB and then you can practice recognizing notes. On the upside I became better at it over time, got it down to 2 seconds per note on average... On the downside the skill did not translate into actually reading sheet music any better outside of the game - it still takes a lot of time for me to recognize the next note. Go figure.