You’re probably familiar with the Theremin, that eerie, siren sounding instrument used in countless science fiction soundtracks and famously in the Beach Boys’ “Good Vibrations.” You’ve also probably never tried one. Thanks to Femur, a company composed solely of programmer Luke Phillips, you can play a simulation on the web for free. Instead of using your hands and antennae to control pitch and volume, you use your mouse or trackpad - left and right is pitch, up and down is volume. You can select from four different waveforms and there are controls for delay, feedback, and scuzz (sounds like ring modulation). For a few bucks you can also buy the app for iOS, Android, and desktop which allows you to record. Try it for yourself.