music - gsce and A levelWatch
It will be your A level subjects and grades that determine your university entrance. Saying that I would expect most A level Music candidates to have done gcse.
If you did end up not doing either, it wouldn't be the end of the world. Most unis don't ask for it (though some do, I know Surrey does). If you want to do music at uni though, I would really recommend it.
Some other stuff unis ask for is a certain level of practical and theoretical ability. Normally grade 5 theory (possible higher if you don't also have the a-level) and grade 7-8 practical (normally grade 8 for Russell Groups). Lots of unis also ask for an audition/interview.
When you say music uni, do you mean conservatoire? They have fairly different course content suited to different types of musician.
I took the music theory grade 5 and 6 at the end of 11 and 12 (received 95% and 85% respectively), grade 7 aged 14 (got a distinction at 97%) music GCSE aged 15 (thrilled to get a 9!) and now I'm taking the A level, with the hope of getting a place at Cambridge. So I'm doing all the options even though it isn't strictly necessary. GCSE music is a bit of a waste of time if you already know a bit about music (hence why you don't need it to do the A level). I would recommend you take the A level though - it challenges and stretches your power of critical thinking and essay writing. The upshot being: take what you want, but unless you're doing another essay subject, I would advise taking music as an A level if that's the direction you want to head into!
If I want to apply to a music uni, should I take a music gsce, or is that too much, and an A level in music is enough? (I would prefer to take a music gsce since I am very good at it, but I don't know if universities will accept it if I will have an A level in this subject as well)