Gotta love these wild guesses! But if you want another possible title thrown into the hat, check out 'Django'—not the Tarantino one, but the original one from '66. It's not as well-known as some of Eastwood's stuff, but it’s a gem with a cool soundtrack.

I think you’re referring to 'The Good, The Bad and The Ugly.' The showdown between the three at the cemetery is what you're describing I think. If it's the music you remember, it's likely to be from this since it's one of the most famous soundtracks ever.

lol u talkin bout toy story's Woody's showdown? Totally has that whistling thing and all. 10/10 would recommend 😂.

I'm gonna go a bit left field here and suggest 'For a Few Dollars More.' The final duel is something else, and Lee Van Cleef alongside Eastwood? Prime western stuff. That pocket watch tune becomes one haunting whistle by the end. Check it out if it's not the one you're thinking of, worth your time.

Is it 'High Noon'? I remember a western with a tense showdown at the end, maybe that's it?

Could it be 'A Fistful of Dollars'? The whole Dollars Trilogy had awesome soundtracks. The standoff at the end is badass and the films made Clint Eastood a star.

If you're talking about a big-time cowboy actor and an iconic soundtrack, you may be referring to 'Once Upon a Time in the West.' It features Henry Fonda and the soundtrack is another masterpiece by Morricone. Unlike the 'Dollars Trilogy,' it's got a harmonica instead of the whistling, but it's equally recognizable. And the final showdown—pure cinematic gold.

Sounds like it could be 'The Good, The Bad and The Ugly' with Clint Eastwood? The music by Ennio Morricone is legendary, whistling and all. That final standoff is iconic in film history, not just westerns!