The tune just kind of popped into my head this evening, and I know I’ve heard it in movie trailers before, with a lot of brass—but I can’t happen to find any them at the moment.
It feels a lot like something Erich Korngold might have written for an Errol Flynn movie, but none of the samples I’ve heard online (like from Captain Blood or The Sea Hawk) seem to match up. It might be a more recent composer like John Williams, or even just be from a stock music library, but I’m at a loss for anything beyond a guess.
Holy cow that sounds really familiar. But if it’s a soundloop/royalty-free stock theme, it would, because they’re made to sound almost-like stuff.
My first thought was Galaxy Quest, but nope, that’s not it. Similar but not it.
And BTW I’m very much doubting it’s of the Erich Korngold era. It’s more late '70s - '90s sci-fi / adventure theme, faux John Williams, as you mention.