Facebook isn't doing this out of the desire to see the world become a more musical place. It is undoubtedly going to make money from the music services that push content through Facebook. And the music you listen to and share is yet another data point that Facebook can sell to those entities who pay for this kind of information.

It will have an effect on music marketing as well. Certainly we'll see music labels and other related businesses pour their acts and partners' work into the timelines on their walls. Celebrities and "trusted sources" will also pump their timelines full of music. So while there is a measure of democratization here, we'll want to keep an eye on services that are promoted to tell us what to listen to, just as radio was tasked with this job in past decades. The less bleak side of this tarnished coin is that artists will also have the opportunity to stream their music to fans and friends.

But perhaps the most intriguing angle is that we are now a source to be wooed and pitched. Your voice, among the millions, matters to those who are promoting a particular artist or label. To what lengths is the music industry willing to go to promote and reward "taste makers" who influence large numbers of "friends?"

This is music worth watching.