If Youtube videos do not play reload the page, that's a Youtube bug.
Or maybe now, a few years later, it's a new bug ;-)

The Kilimanjaro Darkjazz Ensemble - Lobby

Gabriel Johnson - It Never Entered My Mind (The Home Sessions)

The Nest - Kairos

Pharoah Sanders - Astral Traveling

Bohren & der Club of Gore - Unkerich