It seems to be finding snippets of songs similar to snippets. I tried on Metallica - Unforgiven III, which starts off with a slow piano composition, and then enters a riff and cuts out.

It ends up recommending piano songs, many Korean ones.

There's some interesting ones like Ghost - Cirice, where it finds other songs with similar riffs. I like Ghost's music in general, just not the Satanic themes, so this is a great tool for finding similar music.

I'm somewhat amused that it doesn't match Under Pressure with Ice Ice Baby.