Music and English literature are both traditional subjects and preferred by top universities. If you feel more confident in music, then take it~ it's better than failing english lit. if you're not confident in it!
Music is a 'one of a few' a level that shows you're both analytical and practical. It's not an easy subject to study either.
However, if you're not convinced about that, taking english lit. shows you have great essay writing skills if you get a good grade.
Overall, i'd recommend you to ring university admission offices to check.
I'm going to take Music A level for A2 and i'm planning to study law with A2 Human Biology, History and AS english lit.!