Annoy your friends! Enrage your enemies! Bore yourself to tears! This application does just one utterly pointless thing: it sings the entire song "99 Bottles of Beer on the Wall" (starting with 99 bottles and ending when no bottles remain) in an artificial-sounding computer-generated voice.
On the screen, 99 bottles are displayed. As each bottle is "taken down" in the song, a bottle is randomly chosen and removed from the screen. The count of remaining bottles is also shown. So you can be bored watching the screen as well as listening to the song.
Options allow you to pause the song or to start the song over "from the top". The song also starts "from the top" each time you relaunch the app. Those are currently the only options.
Please, for your own safety, if you must sing along, sing responsibly.