English is a generalist subject not a specialised one. With it you can go into research, advertising, marketing, publicity, political speechwriting, business writing, journalism, publishing in print or online, editing, proofreading, AI, gaming, TV, film as well as being a writer or teacher.
I would suggest that almost all of these apply to music - certainly academic research, advertising, marketing, publicity, journalism, publishing, editing, proofreading (although it's not called that), AI, gaming, TV and film all need musicians or have a music angle. Plus writing music and teaching. And performing of course, and working for arts companies and charities and record companies, talent management, instrument making / repairing / tuning, music therapy, session work, theatre work, the military, the church, fixing freelancers, sound recording, editing, record producing, dubbing, A+R, running venues and festivals and radio stations and competitions and awards, education projects, accessibility projects, running orchestras, choirs, bands and opera companies, and specialist schools and conservatoires, and music shops, software development, managing tours, working in copyright and other legal / rights areas, designing, manufacturing and selling all the stuff that musicians need. These are all well-trodden paths for music graduates. (Plus all the usual generic postgrad routes into unrelated areas like law conversion, HR, accountancy, civil service, primary teaching, police etc.)
Music is a massive industry in the UK, £7.6 billion in 2023, it supports many, many careers.