Ever wanted to send a song to your roommate and have them listen in real time along with you? AirPlay doesn't support iOS-to-iOS device streaming, so you will have to turn to a third-party app like Seedio to simultaneously play a song on multiple devices. It's a slick experience with one song, multiple devices and an exponentially loud beat.
Most of the power of Seedio is hidden underneath a no-frills UI that's easy to use. When it launches for the first time, each button on the screen has a label that tells you its function. There are not that many on-screen elements -- one to add music to a playlist, one to set up a device as a broadcaster or receiver, one to share information about Seedio with friends, one to access a tutorial and one over-sized play button to get the music flowing.