[agittins]

That sounds like you'd better install a separate piano app. If you search for "android piano" you'll find many.
The Android task switcher makes it easy to jump between several open app windows.

The same logic would have precluded a metronome being added as well, but now that it's there I'd bet a lot of people would say that having the metronome built-in is FAR better than using a separate app.

I know I can use a separate app (in fact I have and use them), but I'd prefer to have the functionality built-in. Tapping through a melody line by switching back and forth for every note is... well, silly (see note, tap intents button, tap piano app, tap note, tap intents button, tap MS app, see next note, repeat).

The split-screen feature in the latest android might make it work (I don't have that on my tablet yet) but I think having the MDI-style interface of a separate window that can be positioned anywhere works better from a UX perspective in this case, and it will work on any android version.