Girl's in the Band is the nineteenth episode of Season 30.
The director of the Capitol City Philharmonic takes notice of Lisa’s talent and attempts to convince her to join them, which upsets her band teacher; Homer inadvertently puts strain on the family when he works extra shifts to support Lisa.
After the Springfield Elementary School music teacher and band director wakes up from a graduation nightmare next to his boyfriend. He remembers that he graduated top of his class, his once promising musical conductor career failed and led him to teach at Springfield Elementary School where he is now unhappy with the way his has turned out.
While teaching at school, Largo is conducting the school orchestra where he receives an email from the Victor Kleskow, the musical director of the Capital City Philharmonic informing Largo that he will be attending the concert tomorrow night. Largo now newly inspired by Kleskow to impress him, begins training the students with the The Stars and Stripes Forever. The next night is a success, with the children playing Troika from Lieutenant Kijé music, but Largo is saddened when instead of poaching him, Kleskow chooses to take Lisa Simpson for his youth orchestra.
Homer and Marge struggle to find a way to pay for Lisa new extracurricular school activity. Upon arrival in Capital City Kleskow, Lisa finds it difficult to work with Kleskow, as he reveals his true personality, and and how just one simple mistake can make him angry.
In order, to earn extra money Homer starts working a graveyard shift to pay for Lisa's orchestra. Meanwhile, back the orchestra's campus Bart is confined in a closet with the siblings of other musicians. Lisa wins first chair the competition by out-performing another student, but realizes that she has become a selfish person, and how the toll of her new music lessons and associated travel times are taking on her family.
Kleskow offers Lisa the next which is even further away and cost more. Meanwhile, Homer is suffering from sleep deprivation and begins to have hallucinations during his shift at the Springfield Nuclear Power Plant: dancing and drinking with bartender Lloyd from The Shining. In order, to avoid issues for her family and herself, in trying out for the upper-level orchestra, instead fails intentionally ruining her saxophone career.