The Pirates of Penzance
From Memory Alpha, the free Star Trek reference.
The Pirates of Penzance, or "The Slave of Duty", is a comic operetta written and composed by Gilbert and Sullivan in 1879.
In 2368, Dr. Beverly Crusher intended to mount a production of Pirates on board the USS Enterprise-D. She hoped that Lt. Commander Geordi La Forge would play the role of the Major-General. Although La Forge was reluctant, Crusher convinced him to attempt the Major-General's signature song, "I Am the Very Model of a Modern Major-General". However, her efforts (and La Forge's) were interrupted by the collision of the Enterprise with a quantum filament. (TNG: "Disaster")
