 s.ytimg.com/yt/img/master-vfl3 ...
Found in YouTube's CSS file.
"My best guess is that YouTube’s partnering up with musicians/music studios to put those buttons on the YouTube pages that are featuring the musicians/music studios’ music video, and link those buttons to iTunes Store and/or Amazon MP3 so the viewers can buy the songs." googlified.com/2008whats-youtu ...
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