I am in year 11, and I chose GCSE Geography. I very much enjoy it !! I think that because I like it so much, it's so easy because all the facts and terms stay in my head because I pay attention and have some sort of interest.
If you very much enjoy music, they you should 100% go for music. What you do in your GCSEs doesn't exactly matter. However I do suggest you start looking at what you want to do in college because you may need specific subjects to do a course.
In most cases, your GCSE does not have a huge impact, as long as you get the average standard of grade 5s in English Language, Maths and 3 other subjects. (unless a course asks for other gcses)
In conclusion, if you wish to do music then you should, you shouldn't pressure yourself to do a different subject, have no interests and only get a grade 4/5/6.
For geography vs history, you should maybe try see the contents of each GCSE. Maybe flick through the past papers of each and see which one draws your attention more!