The musical discussed in the book is "Thoroughly Modern Millie." This is mentioned multiple times throughout the provided excerpts.

- At 00:37:04, it is noted that there was supposed to be a 2020 Encore revival of "Thoroughly Modern Millie" with Ashley Park starring and Lauren Yee rewriting the book to be less racist.
- The character Abel Pierce is the director of Everett's Theatre Camp, where "Thoroughly Modern Millie" is performed, as mentioned at 00:36:49.
- At 00:41:31, it is mentioned that "Thoroughly Modern Millie" had to be the show, reflecting the author's personal journey with community musical theater.
- The author's personal experience with auditioning for "Thoroughly Modern Millie" when they were 13 or 14 years old is shared at 00:37:47 to 00:38:29.
- Additionally, at 00:39:30, the author describes participating in a stage reading of "Thoroughly Modern Millie" in New York City.

These timestamps provide a comprehensive understanding of the musical's inclusion and significance in the book.