This article from Variety covers some newly-shared thoughts from James Gunn, and talks about the music as well:
Most important:
"Multiple times during the Q&A, Gunn kept returning to the point that he wanted the movie, at its core, to be about goodness, and how much he feels the world could use a story that embraces it."
‘Superman’ Trailer: A Bloodied Man of Steel With Green Lantern, Hawkgirl and Krypto the Superdog: ‘We’re Embracing All of the Mythology,’ Says James Gunn
The first trailer for 'Superman' is out, following a preview with director James Gunn and stars David Corenswet, Rachel Brosnahan and Nicholas Hoult.
variety.com
Most important:
"Multiple times during the Q&A, Gunn kept returning to the point that he wanted the movie, at its core, to be about goodness, and how much he feels the world could use a story that embraces it."