This 1979 song is playing while Lorelai celebrates her exams being over with margaritas. It’s by new wave band the B-52s, from their debut album The B-52’s.The kitschy lyrics and hook-laden harmonies helped give the band a fanbase, and they released several chart-topping singles. The album received mostly positive reviews from critics, who noted that it cleverly recycled early funk and Chicago blues into an eminently danceable party album. The album went to #59 in the US, was most popular in Australia at #7, and is regarded as one of the greatest albums of all time.
This is a callback to “The Deer Hunters”, when Lorelai wore a B-52s tee shirt to the parent-teacher meeting. She told Max Medina she wasn’t really a big fan, it was just something to wear because she spilled coffee on her blouse. Now we see she is enough of a fan to own this album, and to put it on when she’s in a celebratory party mood.
By the way, the song’s title doesn’t refer to a particular number of girls, but is a tribute to those women, both famous and obscure, who rocked the beehive hairdo, otherwise known as the B-52, or just “the 52” (and are therefore “52 girls”). It is this hairstyle that the band is named after.