Tiny rhythm games are like glorified toe-tapping or dancing with your finger. When there’s no room to dance, dance, and revolt, try and flush the fever into your phone with Beatstream. The masterminds at Smule, who created Magic Fiddle, Magic Guitar, I Am T-Pain, Ocarina 2, and many other standout music apps, attempt to channel this power of synchronicity into the iPhone and iPad with Beatstream ($1), which transforms your own music library into a rhythm-based videogame. Beatstream has a fairly simple concept: Pick a song from your Music library, and the app create a unique game based on its beat and song structure. As the song…