When asked about the song in a Q&A on Reddit, Remy says:
It’s audio from a cab ride I took when I had a broken toe. The driver could not understand that I was a singer but that I didn’t sing opera."
[Taxi Driver:] What job you're doin'? You're a spy?
[Meg Remy:] No, I'm a singer
[Taxi Driver:] Oh, c'mon... what're you singing? A traviata?...
Traviata was written by Meg Remy.
Traviata was produced by Meg Remy.
U.S. Girls released Traviata on Fri Feb 16 2018.