I do believe Itunes has limited new music discovery, but only for basic users that rely on Itunes to purchase their Music. Itunes can be seen as the largest and most successful distributor of Digital music, or least poeple have that perception of Itunes. This leaves them with the impression that if it can't be purchased on Itunes, that it cant be purchased legally. Even in Itunes it self, the music you can browse is limited to the music that Major Music studios have selected for sale in your country (see http://www.slate.com/id/2158151/ for an idea.) While Itunes does not limit the discovery of new music in it self, sole reliance on Itunes limits what you can purchase. It all depends on how you limit your self to discover new music. As I stated, I agree in limited context.
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