Rock Band is an interactive music video game developed by Harmonix that allows players to form a band and play popular rock songs with the help of controllers shaped like musical instruments. It offers deep online functionality, enabling players to connect with each other across the globe, while also gaining access to master recordings from renowned punk, metal, alternative classic and southern rock artists. Players can choose their own avatar using Rock Band's character creator feature which includes gender, body shape, face features and signature moves. The game ships with 45 tracks from bands such as Bon Jovi and The Ramones as well as downloadable content available every week including full albums such as Who's Next by The Who. Furthermore, Metallica has signed up to provide several tracks in digital format for the game plus Enter Sandman on the ship disc. During gameplay vocalists have freestyle vocal fill windows during which they can ad-lib lyrics or shout at the crowd while drummers are able to showcase real solos through Freestyle Drum Fill Windows where anything goes! If one player fails out of a song due