My husband used to play classical guitar, he got to grade 6 in the UK.
I'd like to get him some scores of music along with audio (CDs or
iTunes) of the pieces to listen to. He says the only sheet music he
has learnt from is the examination books -- but he now finds those
exercises boring and would like something longer to work on.

So what I'm asking for is your opinion on which classical pieces (a
list of four or five?) a competent but inexperienced guitar player
might enjoy learning, along with links to where I can get ahold of
scores and audio.