The latest revival of the classic Shakespeare tragedy stars Zegler as Juliet and Kit Connor as Romeo.
And while its not an out-and-out musical, it does feature a few new songs from Antonoff.
Man of the House is the first offering from the show and was co-written with singer-songwriter Ryan Beatty.
Rachel Zegler and Jack AntonoffBruce Glikas/Getty Images; Kristina Bumphrey/Variety/Getty Images
Its unclear yet if the full soundtrack and score will get an official release.