Ecstasy of gold is this one, Metallica played this too with the San Francisco Orchestra and it was as epic as you’d imagine:

www.youtube.com/watch?v=PYI09PMNazw

One we’re looking for today though is this one (the main theme):

www.youtube.com/watch?v=J9EZGHcu3E8

Doesn’t quite have that same riff, but some of the musical themes were reused in ‘The Trio’ which finished up the movie:

www.youtube.com/watch?v=OiIe2znA1ao

Admittedly, it’s hard to find a song based on someone just writing out the sounds they think it makes and I feel like any Ennio Morricone score really should be thought of as a singular piece in harmony with the movie itself. This was one of his best, one of those movies where the dialogue could be optional, sometimes you didn’t even need to open your eyes to understand what was going on.