The title tells you exactly what this is: music that can't exist without the device playing it. Symphony Impossible to Play is a 2011 iOS interactive music app where touch and motion shape the compositions in real time. The four classical movements from Overture through Anthem feel structured and intentional, like foundations you're meant to build on.
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Then the second half gets elemental. Rain has this liquid, rippling texture. Frost sounds like it's crystallizing as you listen. Clockwork is all precise, interlocking mechanical patterns. The whole thing blurs the line between soundtrack and instrument.
If you've ever wished you could reach inside a piece of music and rearrange it with your hands, this is literally that concept turned into a game.