Online virtual pianos aren’t exactly a rarity, but being able to jam with friends easily is. The Shared Piano beta from Google’s Chrome Music Lab makes it dead simple, though, and no musical instruments or MIDI controllers are needed. Just load up the web app and send the link around to create a virtual practice space. You can choose between a piano, drums, strings, woodwinds and more to create your own songs.
Made clear by its sparse UI, Shared Piano is in beta, but it performs well. Lag doesn’t seem to be an issue -- it’s seamless for multiple people to stay in tempo -- and the piano roll makes it easy to see who is playing what. It works on both desktop and mobile, with desktop users entering notes with pre-assigned keyboard strokes and mobile users tapping their touchscreens. Polyphony is limited to six voices, so you won’t be able to play huge chords, but that would probably be beyond the scope of this project, anyway.