If you ask some musicians, Spotify is a trap; they earn so little from the service that they'd rather pull their albums and risk additional piracy. That's not necessarily true in every case, though. Kobalt Music Publishing, which represents songwriters like Lenny Kravitz and Paul McCartney, claims that its artists earned 13 percent more royalties from Spotify in Europe during the first quarter of the year than they made through iTunes sales. That's a sharp contrast from the year before, when iTunes was still the dominant money-maker. Kobalt claims that it's all about volume. While songsters get far less revenue per person from Spotify, the sheer number of listeners (three times as many) makes up the difference.