Activision today confirmed that Guitar Hero III: Legends of Rock Companion Pack (soundtrack CD) will be released on October 23rd, 2007, featuring not only the key songs on Activision's game, but also exclusive access to more gameplay with three previously unreleased expansion songs. Each Companion Pack includes a code you'll have to input on Interscope's website in order to get an Xbox Live code which will allow you to download the tracks. Check the press release for more details.