So you want to jam like a rock star, but you don’t want to shell out for an electric guitar? Make one yourself. Sound artist and member of NYC Resistor Ranjit Bhatnagar explains the art of a DIY instrument he calls a “junk guitar.” You can piece one together using little more than a plank of wood, some magnet wire and a guitar string. Upgrade those air guitar solos. Plug in. Rock out.