So you've crooned with Karaoke, became a rock star with Guitar Hero, may have even become a drum God with Rock Band, what's next? The Cello. The Berliner Philharmoniker has added a cool flash game called Cello Challenge to their site, one where you can use your mouse as the bow for a cello and try to play The Swan by composer Camille Saint-Saëns. Move the bow to the rythm of the music and keep the large circle around the smaller one and you'll hear The Swan as it was meant to be, but play poorly and you'll hear a stringed instrument at it's painful worst and you won;t need a crowd to boo you off stage, you'll do that yourself.