Michael Giacchino, possibly. He does brassy pretty well. Rogue one was interesting the way it incorporated so many motifs unique to the A New Hope soundtrack, including the little-known original Vader theme. I really dug that. And, the ma3jor theme is actually based off a melody that only occurs once in the original soundtrack once ( when Luke is telling Obi-wan he can't get involved. ), which was extremely clever. It's like the themes continue to be used in a movie that was made decades ago. And he did all this with very little time.
Although, I would have liked to have heard Alexander Desplat do Star Wars. I enjoy his Grand Budapest Hotel soundtrack.
I liked the soundtrack for the first Fantastic Beasts (I dug the introduction of more jazzy style motifs to fit a 1930s urban American setting), but I was a little underwhelmed by the stuff James Newton Howard did for Solo.
Ramin Dijawdi can be good, but I prefer his more offbeat work for Westworld than his more Williams-style Game of Thrones score.
Bear McCreary is also good, but I'm not sure that his style fits.
Uses original Vader theme (2:45):
Check out 3:39 in the second video.
Compare to this (
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The first time I watched the movie, I didn't know what to make of this score, because I thought it was going to lead somewhere familiar, and then it didn't. Upon rewatches and relistens, though, I think it's a brilliant idea for a movie that take place adjacent to a story we all know well, containing characters who are not major players, but without their contributions, the main story would not be possible.
I would have liked a score for Solo more like this, working in stuff like Lando's beautiful ESB theme (which wasn't used nearly enough! Only two or three times!).