I've got some knowledge of music already, but have forgotten a lot of the theory. I always hated the theory anyway - and didn't advance past Grade 5 piano because I refused to do Grade 5 theory which was a prerequisite. Now I'm having to relearn some of the theory - along with learning lots of other things for music and other subjects. I must be thinking of it at night unconciously, because I woke up in the middle of the night last night and when I'd woken up enough to have some awareness, I realised that inside my head I was reciting "quaver, crotchet, minim, dotted minim, semi-breve"!!!!!!