I challenge anyone to come up with a better 'showdown scene' theme than Sixty Seconds to What? from For a Few Dollars More. Awsome tension-building music and the payoff to a major plot thread in musical form? doesn't get much better than that.
If you find the flute annoying, you might prefer this Alessandro Alessandroni version starting at about 3:00 in.
And from the sequel, Silhouette of Doom (you heard it in the teaser trailer)
The film The Legend of 1900 is an entire movie about a pianist who lives on a cruise liner. And yet, for all the film's music, the piece that stands out is, although haunting and powerful, the most simple.
Morricone is famous for his spaghetti western scores but he is also famous for others too. Among others: