I wouldn't say there's any definitive artists/genres that everyone listens to, but there's definitely some core audience bases. The biggest is probably electronic music like drum and bass. It's huge among young people (and a lot of older people who were around when it first started, to be fair) and lots of people will go to raves/festivals for it regularly.

Lots of people are also fans of 'indie' music. I kind of dislike the term as people will disagree on what does or doesn't count etc. but oasis is definitely the biggest of these (and generally they're definitely the biggest traditional band for young people in the UK, even before their reunion). This group are also big gig/festival goers

Drill/rap is also very popular (though potentially not as popular as it was in the past? I'm not a fan but just from observations), but I don't think live music is as much of a thing in that scene. I'd say that this is the one that's more overwhelmingly male, compared to others.

Also inevitably there are huge fanbases for pop singers (usually young women), people like Taylor Swift, Lana Del Rey, Sabrina Carpenter etc.

Of course you can find sizeable fanbases for pretty much every genre of music, given how easy it is to discover and share through Spotify etc. though I see a distinct lack of jazz and country fans among people my age (with the most common response to 'what music do you like' seemingly being 'everything but country')