inappropriate line imo.

Next Id say soemthing like "Do you listen to a lot of music like this? Gives slight (Insert tease) vibes but its a gem."
Goal here being to ask her a question centered around her (her fav subject) and then flattering her so she's most likely to respond (+ a slight tease because that's always fun and show's you aren't super reactive and backing down from your previous tease)

For the tease you could say "Old lady vibes" idk lol. Be creative and add your personality if you use that.