I am frankly disappointed that it wasn't in there to begin with. Like 'Flight if the Valkyries' yes that's great, but come on Kojima! You make a game set in the 70's, and features helicopter as a core game mechanic, really? As much of a movie buff he is I would think that he would have either had that or some CCRish tracks (some Foghat maybe?). I would say that CCR should be in the next game but, it's Unfortunate (son) that since The Phantom Pain is set in the 80's it would seam a tad outdated.
Crank the Creedence brother!