Headphones are seen in front of a logo of online music streaming service Spotify in this illustration picture taken in Strasbourg, February 18, 2014. Spotify is recruiting a U.S. financial reporting specialist, adding to speculation that the Swedish start-up is preparing for a share listing, which one banker said could value the firm at as much as $8 billion. REUTERS/Christian Hartmann (FRANCE — Tags: BUSINESS ENTERTAINMENT LOGO) — GM1EA2I1FZ401