I've been awarded a book token from my school for effort last year, and with it I have to buy a book to be presented with at our annual awards evening. I'd like to get a musical encyclopaedia as my current one is very old and some of the ideas have changed. Can anyone reccomend any particularly good ones? The book token is worth £7, but my parents have said that they will add to it if there's a book I'd really like.

This is the one I've got and really like it, don't know if it's definitely what you're after but I find it useful.