Goldsmiths Computing courses- what are they like?Watch
The other 2 modules I do that the other courses do not do is Problem Solving (in Python) and Fundamentals Of Cs (essentially the theory of computation). If you really hate the theory side then I suggest not to do Computing then and perhaps the other courses.
If Music is your passion I do recommend doing it as most people will succeed in Uni doing a course that you're GENUINELY passionate about not because of the money or you think its "interesting". You will have much fun creating programs involving music e.g. a beat detector or music editing program. I don't know what the difference between Creative and Gaming computing is to be honest but i'd imagine they're quite similar. You can ask the teachers there for more details when you visit.