not available at the release of Guitar Hero II for the Xbox 360, RedOctane has stated that they hope to be able provide this later once they are able to work out the technical issues. Practice mode Practice mode is a new addition to the game, allowing a player to practice certain sections of a song ("Verse 2," "Chorus," "Bridge 3," "Gtr Solo 4," etc.) on different difficulties and instruments. Practice mode gives the player the ability to toggle the speed of the notes (Full Speed, Slow, Slower and Slowest) and does not stop a song no matter how many mistakes are made. Players can play the bass guitar lines on most songs. On others, a rhythm guitar line is available instead. Soundtrack 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. Most of the songs featured in the main set list are cover versions, with the exception of "Stop!", "Possum Kingdom", "Dead!", and "John the Fisherman"; these four are based on master recordings. The unlockable bonus songs are all master recordings, including some specifically arranged for use within Guitar Hero II. Cover songs are credited on screen with the phrase "as made famous by" (for example, "Heart-Shaped Box, as made famous by Nirvana"), while the original songs are credited with "as performed by" (for example, "John the Fisherman, as performed by Primus"). RedOctane stated that the Xbox 360 version of Guitar Hero II "planned to feature more downloadable content than any other 360 title" utilizing the Xbox Live Marketplace, including many of the songs from the original Guitar Hero a week after the release of the game. Four such