How I select the music to arrange?

I’ve been asked how I select the music to arrange. Well, I play through a lot of music that I can find (original folios or other arrangements) based on the theme of the book I’m working on. It certainly improves my sight reading skills. I then select based on playability (some pieces are much too difficult for my purposes but I don’t shy away from challenging music) and enjoyability in terms of being able to listen to the music and liking it. Less than half of what I explore meets these criteria.