QUOTE(Miss Ross @ Jun 11 2008, 09:24 PM)

It's quite subjective I think - it really depends on the individual, what they want to do and what suits them. It's not really 'one size fits all'.

At least, that's what I found when I was looking round and applying.
I'm inclined to agree ... a '5*' rating is just an assessment of a department's research record, and is frankly pretty irrelevant to undergraduate students (might even be a disadvantage, since staff may be more interested in research than in teaching you).
Entirely depends what you want from the course: lots of playing? Great academic teaching, pushed to achieve results? Prestige? Good facilities? Good employment chances? A friendly place without too much competition where you'll be happy and develop?
These aren't mutually exclusive, of course, but you'll probably get the best idea by making a short list and then visiting as many as you can, or asking people who are already there. It may help you to think about whether your interest in music is primarily academic or practical (or both), and what sort of music you see yourself playing ... that may help to whittle down the choices.
You can get a rough idea by looking at the national student satisfaction survey (which is online) or at the Guardian or Times University guides, which draw on the survey - though some of their judgments, in my discipline at least, seem a bit strange! The problem can be that very few students (very few undergraduates, anyway) have experience of more than one university, so they may not really know how their's compares ...
I've taught in two top-grade universities (NOT in music departments) in recent years; both have a similar reputation, but the undergraduate experience is very different in one from the other. And in two less well regarded, where the experience was different again.
nick