Olivia Rodrigo's debut album, Sour, is out May 21, less than six months after she shattered streaming records with the breakthrough single "drivers license." Renee Klahr/NPR Lowercase girls tend to fly under the radar by design, but once you start looking you'll see them everywhere. For one thing, they've been all over the streaming charts in the past few years: folklore, evermore, "thank u, next," girl in red, mxmtoon, dodie, beabadoobee, how i'm feeling now, "drivers license," "deja vu," "good 4 u" — to name just a few recent, femme-forward musical phenomena that wouldn't even think of imposing the tyranny of capital letters on the listener's imagination.