The companion research article for the film, with an expanded range of topics and the sources, has been published in _American Music_ 41(3). (For some reason, the reason issues of the journal are dated 2023 rather than 2024).

https://scholarlypublishingcollective.org/uip/am/article-abstract/41/3/357/39201

If you don't have access to an academic database, you may request a copy from me.