This is a pretty metal track with all sorts of crazy time changes. I don't listen to Prog very often but when I do it's generally King Crimson.
The third track from the 1974 album Red by King Crimson. This was the final album from King Crimson until 1981 with Discipline. Anyways, this song is awesome so enjoy!
Have I jammed this before? Eh, doesn't matter. Time for some heavy as fuck riffs.