MusicSpectrum app for iPhone and iPad

There are "banjo", "guitar", "drop D", "soprano ukulele", "7 string", "bass", "Mandolin", "baritone ukulele" 8 musical instruments, which can help to understand the position of the tone in these instruments. Without the help of teachers, you can also recognize the music score.
Just like "natural pronunciation", you can read words, listen to sounds and write. Its a very good app for learning musical instruments. I hope you can achieve it, you can play when you see notes, and you can sing when you see notes.