The Jaguarr

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The Jaguarr is a service that allows people to send songs to their friends in a phone call.  Just SMS The Jaguarr a number and a song, and it will call out to your friend with that song.  Fun!  The Jaguarr also allows you to attach songs to foursquare places - attach a song to a place, authorize foursquare, and get a song-call whenever you check in.