When I say playable I mean for real. If you interact with the harp it player threw a set bunch of tons. My suggestion is to make it a working harp. The string you point at affects what note is played. I think you will find that the more creative players will surprise you with what they do with it.
Also why stop at the harp? Lets do something with the drums. maybe make 2 or 3 that each have a different ton. I’m spitballing now but I’m saying lets add some skill to the music.