20 years ago I designed and built a machine interfaced to an Acorn PC which could do the opposite. If you whistled into the microphone, the computer played back the tune and printed it out in musical notation. It also displayed the tune on the monitor as musical notation. This allowed non musicians to have a hard copy of their self composed tunes. You could, of course, have an electronic keyboard hard wired to the PC in those days, but my machine picked up soundwaves. I was told to patent it but I never did and now there are chips which do everything.