At first I thought it was Pink Floyd, as they did do the original song, but then I thought it was possible that this is a very good cover. Without hearing the vocals that were cut from the version used on Moscow Classic, I can't really tell.
Thought it could be Shadow Gallery's cover
, for a minute, but the heartbeat/clock sound isn't quite the same as theirs.
I am still thinking it could be a cover, but there are so many covers that I couldn't tell you which one, especially since I have no vocals to work with.