I see it as a sequel to this Roger Waters track from Pink Floyd's Ummagumma.

In fact, to listen to it properly, you need to listen to this track first:

https://www.youtube.com/watch?v=NyBh2GAL0bE

and then that:

https://www.youtube.com/watch?v=GpWJv7alqQE

Taking LSD about two hours before this will enhance the experience.