Speed Of Arts allows you to play music with others over the internet. We have dozens of instruments for you to play, and touch screen compatible keyboard. Join the public room, or start your own room and invite your friends. Just download the app, and start playing immediately. No accounts required!
If you're a musician you can also use your own MIDI keyboard, just plug it in and you'll get a popup to choose your input device.
This app is great for piano teachers, incorporate this with your classrooms and your students can practice together.