For sure bro.
It's a compression horn driver set in a box. The model I used is the MCM-40, which goes for around $25 bucks online.
You'll need an amp, as well. And tubing, obviously.
Your keyboard (or guitar, if that's your instrument preference) goes into the amp. The amp outputs mono to the compression horn driver, and ever time you hit a note with your instrument, you manipulate it with your mouth.
Very simple, really.