Just hours after we learned that Twitter had partnered with SoundCloud to enable music and audio sharing within time lines in their iOS and Android apps, Apple's iTunes joined the party. And along with easy acces to music triggered by hitting a new play button within the Twitter app, Apple added purchasing the track or album you've previewed just a few clicks away. Twitter audio cards could become a very profitable tool for musicians - a 99 cent impulse buy embedded in a social platform driven by immediacy. A few tweets from key influencers and a new track is at...

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