Trump should use “Also Sprach Zarathustra” - the theme from 2001: A Space Odyssey! originally by Richard Strauss. Only need a minute and a 1/2. Probably enough to open any event.
https://tvtropes.org/pmwiki/pmwiki.php/Music/AlsoSprachZarathustra
or
The opening to the original “Conan The Barbarian”. - “Anvil of Crom”
https://www.soundtrack.net/album/conan-the-barbarian-vsd-5390/
Though John Milius probably wouldn’t allow it!
The Richard Strauss piece would be probably the easiest to get permission to do. I am sure its in the public domain now.
“Trump should use “Also Sprach Zarathustra”
Maybe it’s because I first heard it more than half a century ago, but I would have to call it “magnificent, but done to death.”