There's speech and original musical content, like bootlegs, mixes, that cannot be detected with fingerprinting.

For a free Spotify without ads, have a look at http://www.stationripper.com/ (it's old software)

Edit: Station Ripper had caused a law/politics debate in 2005 in France about the right to do private copies of legal media http://www.assemblee-nationale.fr/12/amendements/1206/120600...