CHARLOTTESVILLE, Va., Oct. 12 -- The University of Virginia issued the following news release:

Call them JP and the Morgans, or Vanguard Halen, or the Salmon Shorts Club. While this a cappella group calls itself the Tonics, they don't mind the jokes. In fact, they're grateful for them.

The Tonics, a Philadelphia-area vocal ensemble founded in 1990 consisting almost entirely of middle-aged men, have gone viral, raking in millions of views and stories in news outlets like NPR and the Philadelphia Inquirer. A typical video consists of the group singing around a kitchen island, with viewer comments like, "When the monthly annuity meeting starts to get a little out of hand," or "Not a single out-of-date tax return between them."

"We're pretty...