The ultimate in vintage hybrid synths...

Back in my day, we walked three miles to school in eight feet of snow (or was it eight miles in three feet of snow?) and we couldn’t afford a fancy digital-analog hybrid like the Evolver. We had to make do with what we had, and that was the IBM 1403 printer attached to the IBM mainframe computer. Once we were done computing ballistic missle trajectories, we took a much needed breather by teaching that printer to play “Raindrops Keep Fallin’ On My Head,” among many other hits.

Well, not “we” in the specific sense, but a more general American “we.” Check out the recordings from a 1970 glitch/chip music performance of mainframe and printer with occasional banter. Computer History Museum.