For instrumental music with no vocals, try: Wide Eyes, Invent Animate (their instrumental versions), Modern Day Babylon, I Built the Sky. These aren’t quite Death Metal, but they have really complex guitar and drum pieces.
For with vocals: Sea in the Sky, Ignea, Unleash The Archers, Corelia (also has instrumental version of their 1 album)
Plenty of pigs are already on his side, and would help him with this willingly.
Also, as president, SCOTUS has already ruled that he can pretty much do what he wants as long as it’s an “official” act.