Watch: Musician plays a saw with his bow and it's nothing short of magnificent

Can someone with a better ear than mine (that’s not hard to find) distinguish between a musical saw and a theremin? cuz, man… they sound exactly the same.

quote from the first wikipedia links:

A musical saw, also called a singing saw, is a hand saw used as a musical instrument. Capable of continuous glissando, the sound creates an ethereal tone, very similar to the theremin. The musical saw is classified as a plaque friction idiophone with direct friction under the Hornbostel-Sachs system of musical instrument classification, and as a metal sheet played by friction under the revision of the Hornbostel-Sachs classification by the MIMO Consortium.