It's coming from the tables on the Lawn.
It's leaking from the windows of 1516 Jefferson Park Avenue.
If you are willing to pay -- or to spend some time with your computer -- it could even be playing in your car or dorm room.
It's a cappella, and it's everywhere at the University.
Last night's Rotunda Sing was one of the University's biggest a cappella events, but it's only the beginning.
Second-year College student Julianna Frisch said she thinks part of the attraction of a cappella is its long history at the University.
"It's part of the tradition of U.Va.," Frisch said. "It's enjoyable to a lot of people."
Third-year Engineering student Jon Evers said his experience with a cappella was limited mostly to his first year.
He believes the popularity of a cappella is a result of the groups' talent.
"It takes a lot more talent to sing a cappella. All of the groups are really good," Evers said. "A lot of people around the University appreciate stuff like that."
Fourth-year College student Courtney Fenner said she also lost track of a cappella after her first year, when she knew the names of all the groups and watched them sing outside her dormitory.
Fenner said she thinks a cappella gets its popularity because of a lack of other musical outlets.
"Our music program is not really strong," Fenner said. "People adapted and formed a cappella."
For first-year College students Anna Kavalauskas and Carter Taylor, a cappella madness is on the rise. Two of their friends just joined a cappella groups.
Kavalauskas and Taylor have encountered an impressive number of a cappella performances, considering their short time at the University. Nearly every major first-year event -- from Fun Fest to Convocation to the first-year class dinner -- has featured one of the groups.
"I think a cappella is bigger for first years than everyone else," second-year College student Bridget Moriarty said. "The first-year girls think it's cool, and that the guys are cute."
Two of Frisch's roommates are members of the Virginia Belles, so she has even more contact with a capella groups than the average first year.
"Whenever any music is playing, they all sing," she said. "I don't sing anymore."