Both the PlayStation 2 and Xbox 360 versions of "Guitar Hero II" feature the same core 64 playable songs (40 licensed, 24 bonus songs). Among the featured tracks are Van Halen's version for The Kinks' "You Really Got Me", "Sweet Child O' Mine" by Guns N' Roses, "Girlfriend" by Matthew Sweet, "Woman" by Wolfmother, "War Pigs" by Black Sabbath, and "Free Bird" by Lynyrd Skynyrd. The Xbox 360 version of the game contains 10 exclusive tracks not included in the PlayStation 2 version, including "Billion Dollar Babies" by Alice Cooper, "Rock and Roll, Hoochie Koo" by Rick Derringer, and "The Trooper" by Iron Maiden. Additionally, the Xbox 360 version allows for downloadable songs to be purchased on the Xbox Live Marketplace. The Xbox 360 version also features a reorganized set list that provides a more balanced progression in difficulty.