I came across these comments on song writing by Eno..:
'Song-writing is now actually the most difficult challenge in music. It's very easy to make music now but lyrics are really the last very hard problem in music. What I think lyrics have to do is engage a certain part of your brain in a sort of search activity so your brain wants to say 'here are some provocative clues as to what this song might be about'. They don't have to be explicit... in fact for me they certainly shouldn't be explicit'.