Need help identifying this Western-themed music

I have a musical theme going through my head and I don’t know what it’s from.
I don’t think that it’s from a song. It’s sounds majestic and it’s like a soundtrack in a Western movie from the 50’s or 60’s. I can see the cowboys and the wide open spaces. Could be from a TV show.

The melody is: E_G____A_G_F_C____E_G____A_G_F_D____ (A rough attempt at the rhythm.)

After repeating the first phrase, I think that there’s something like this: C_EED_C_CEED_.

Any idea?

That’s the theme from The Magnificent Seven, by Elmer Bernstein, I believe. Wait for :24 and you hear the theme.

Thank you very much!!