<iframe width="580" height="385" src="https://www.youtube.com/embed/PV_w38ldZaE" frameborder="0" allowfullscreen></iframe> <br>Imagine you could draw musical instruments on normal paper with any pencil (cheap circuit thumb-tacked on) and then play them ... <br><a href="https://www.youtube.com/watch?v=PV_w38ldZaE">source</a>
