"What’s interesting about Vertigo is that the app lets you share music with a plus one, your core group of friends, or to the public on a beat-for-beat level. In other words, you and your family across the country can listen to the same song at the exact same time using the app.
To avoid legal snares around public performance and distribution, Vertigo connects in to users’ Spotify Premium accounts and merely activates songs that those users already have a right to listen to."
https://techcrunch.com/2017/01/1...
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