[UPDATED] Audio hardware maker Jawbone has debuted Drop. The app plays instant mix based on your favorite songs from Spotify or Rdio, and take song requests from your friends through Twitter. Users reply back with a song they want to play. It appears to be based on Playground.fm which Jawbone acquired last year. Playground's original site is now offline. Drop was created using Twitter’s new Fabric SDK, which enables developers to more easily connect Twitter to other services - in this case Rdio or Spotify. So far the app is only available in iOS, Here is how Jawbone describes the...

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