The song list for "World Tour" started as the list of songs that Neversoft wanted to include in "Guitar Hero III", but had failed to get into the game or as downloadable content; the list was eventually expanded to over 500 songs. The song list was then prioritized based on what the team thought would be best in the game, and then going after the music that would take the longest time to license, as was the case for the Jimi Hendrix songs. While songs were selected to make sure that guitar, bass, and drums all had great parts, they also opted for songs that would be strong for one single instrument as to make the game still appealing for those playing the single player modes. Some songs were also suggested through the licensing efforts by Activision for inclusion in the game. Flores stated that the inclusion of caricatures of recording artists in the game was either due to the team seeking that specific artist for the game, or the artist approaching the development team and requesting to be part of it. The band Tool, which hasn't licensed its music since 1996, allowed for the inclusion of three of its songs in "World Tour" as long they were involved with the artwork and tracking of the songs for the game, leading to the creation of the art-like Tool venue.