I'm listening to this piece by Entheogenic.
The part starting from the time shown by the link, has something in it that I'm sure I heard from Pink Floyd, but I can't remember in which song.
Anyway, my musical knowledge is so poor that I can't understand what's happening that made this part so similar to the Pink Floyd one (well I can't remember the song, hope some can) What's happening? Is just a chord progression? Is there a modulation from some key? Does this come from somewhere before both Pink Floyd and Entheogenic?