The 15-year-old artist osquinn, who has also recorded as P4rkr, saw her song “Bad Idea” take off on Spotify’s Hyperpop playlist, and beyond.Credit...Justin T. Gellerson for The New York Times One night this past February, osquinn got into an argument on Twitter and decided to make a song about it. From her bedroom in the suburbs of Northern Virginia, the 15-year-old logged onto a server on the tex