Yeah, I couldn't quite work out what you meant by the music one - though as an aside I know a couple of people were filling in their card with audio books, which I thought was cool even though I'm not a fan myself.

The forgotten classic was really tough I think most people sort of went 'er, this one I guess?' I had trouble with the 'bestselling' book in 2014 because it's so hard to find out if stuff was a bestseller unless it's on some sort of list right now. The non-fiction, I think was much easier than 'based on a true story' which stumped me for ages. And it's easy enough to find a short, non-fiction book about something you're interested in (say birds, or bee-keeping or whatever. lol.) I liked that one because last time I read about space :D

Books are fun, I loved this challenge because it made me read more.