Citing Prince and Bowie in one episode was pushing it, but let's note that Tilly is supposed to be an oddball misfit, who probably didn't listen to the same music her peers did when she was a teen.
And I'm always glad to see Trek move beyond the idea that future people prefer classical musical, Gilbert & Sullivan, and other "highbrow" art and culture. If Picard can like his old detective novels, and Paris can like old "Captain Proton" serials, and Spock is familiar with the literary work of such masters as Jacqueline Susann and Harold Robbins, I can live with Tilly liking classic rock from the 20th century . . . . .
Tilly found an archaic hard drive with a folder call "My Napster Downloads".