Beep provides a sort of middle ground between a $99 AirPlay receiver, like an AirPort Express or Apple TV, and a system like Sonos where a wireless bridge costs $50 bucks in addition to a Connect or Connect:AMP which are $349 and $499 respectively. If you already have your own stereo system and a few bookshelf speakers throughout the house, Beep can sync music across them at $149 for each receiver. Beep requires their app to play music, which currently gets music from Pandora or directly from your phone, with more sources coming soon.