Although we've covered many ways of getting free books and music before, Noisetrade has a huge selection of both—and it's all legal.
The items have a requested "tip" you can leave to pay for your download, but all they ask for in return is an email address and a zip code to get the download link. The privacy policy states that by doing this, you are agreeing to future emails—but you can opt out of those after the fact. If that's a concern for you, use a disposable email address instead.
The book collection is somewhat limited and the music doesn't include many artists you've heard of, but it's free, so it's worth checking out—you might discover something you like. The music is in mp3 format and the books are available in both mobi and epub. Check out the link to see the full selection.
Noisetrade | via Mother Nature Network