Guitar Hero: World Tour is the fourth main game in the series and brings a major change to the concept. Following the release of Rock Band , which built on the Guitar Hero concept but added additional instruments, World Tour introduces these as well to allow players to play together simultaneously as a real band. The game comes with new peripherals like a microphone for vocal parts and drums for percussion. The guitar tracks are split up for lead and bass, with the lyrics and vocal pitch shown near the top of the screen, while the bottom part is divided into sections for each instrument type.
While playing, a rock meter keeps track of successive notes hit, leading to score multipliers. When the meter becomes too low, other players can make up for this on a shared performance meter. Players also share a star power meter built up by playing through certain sections successfully.
The game has four difficulty levels and a new beginner mode where notes are made as easy as possible. The majority of the game content is centered around Career mode, where players start a new band, choose an avatar and instrument, and play different gigs unlocking new songs along the way.
Players can earn money by completing tracks, which can be spent on outfits or instruments. There are encore songs and "boss challenges" where the lead guitar enters a duel, similar to the battles in Guitar Hero III , but without power-ups.
Bands can consist of offline players, with online members able to join as well. Complete bands can take on others online through the Battle of the Bands mode.
The Wii version also includes a Music Studio editor where new songs can be composed and shared using the GHTunes service. In this edition, avatars can be customized with more detail using the Create-a-Rocker mode, featuring major artists licensed to appear in the game. Several bundles are available for the game, including versions with different amounts of instruments and a stand-alone version compatible with previous games' controllers.