matthewr
spɹɐʍʞɔɐq spɹoɔǝɹ ɹnoʎ sʎɐld
What about current stuff e.g. Yard Act, TTSSFU, Whitelands etc etc? Liking Gang Of Four, whilst clearly absolutely superb taste, is the equivalent of my having a Frank Sinatra album at the point I bought Entertainment or saw them live with Delta 5 and Pere Ubu!
Ironically the gateway to Gang of Four was the people who ripped them off. She was listening to Franz Ferdinand and Bloc Party's "Banquet" which I think was a bit of a social media hit all over again and the algorithm does the rest and soon points you to GoF.
I don't know much about the new music she likes which seems a bit random. But there is lots of Indie stuff from the 90s so it's definitely a thing for her. I suspect some of this is boyfriend related and possibly he is getting stuff from one or both of his parents as the ages check out for them to have liked this sort of thing back in the day. Although I should stress she is very much her own woman and has very definite views about what is good and what is "mid".
The other thing I noticed in talking to her today and listening to music on Spotify is you will look up a band from way back and everything has 570k views, say, but one track will have 14.5M. Which I think is the song got used in a tv show effect. This is the Guided By Voices song she likes which has 100 times as many views as the other songs on "Alien Lanes". Although still not that many because GBV were never in danger of worrying the pop charts even by Indie standards.
She has had my Jazzmaster for the last 6 months and is saving up for her first guitar -- probably a Classic Vibe of something like that (hard to beat for a first guitar I reckon). So we even had a "Which guitar?" conversation and gratifyingly it was Jazzmaster, Strat or Tele because she has already decided she is a single coil type of girl which further burnished her solid indie kid credentials.
(I can never answer that question. I honestly think the best answer is the one you think is cool and looks like the one your favourite band plays.)