The best thing to do is narrow down your university choices NOW!! I know its so soon to be thinking about university but I am in your exact same position and that has helped me a lot.
I am currently in year 11 studying 15 GCSE's in Core Science, Biology, Chemistry, Physics, Maths, English Language, English Literature, Geography, Ancient History, French, PE BTEC, PE BTEC extended, I.C.T, Prep for working Life and Religious Studies. In year 9&10 i managed to gain four of these which are Core science at an A* PE BTEC and PE BTEC extended at distinction+ (equivalent to an A*) and Religious Studies at an A grade. and my target in every subject is an A* and i am meeting this in every one but french. so enough for the low down on my life.
I was interested in medicine at university and so spoke to many universities on the phone and via email as well as making visits to Oxford and Manchester open days. they said the best option is to look at medicine entry requirements as it will show you the subjects you need to have and what grades at A level to get into university.
For Medical candidates they would like to see obviously subjects specific to the area of medicine, but also they want a depth of thinking and knowledge in another area, so you are not just boring.
Manchester, Cambridge and Oxford (the three biggest universities serving for medicine in my opinion) all want three A levels. Manchester want AAA grades whereas oxford would prefer A*AA grade similar to Cambridge.
The subjects needed to apply for the course are the same all around. Chemistry is a must at A-level and is the standard requirement, if you did not take chemistry you will not get a place very simple. the next is one from Biology/Physics/Human Biology/Maths/Further Maths (note: maths and further maths are not accredited if you take both, so i would reccomend against further maths unless you are likely to drop this subject, yet they will still prefer a wider range of subjects). Finally they would like another subject, any as long as it isn't general studies and critical thinking.
so with that in mind i believe that you should be very cunning with your choices, and i would reccomend Music because its important to get a good grade and you seem very talented in this area.
I hope you take my ideas into account x