Deluxe two disc (CD + PAL/Region 0 DVD) edition of their 2010 album includes a bonus DVD. Killer Grass, their eighth album, contains seven original songs and six Rockgrass re-interpretations of previously known works (by everyone from Mozart to Queen to The Prodigy), all of which focus on themes of killing and death hence the title, Killer Grass. The DVD contains music videos for six songs as well as five instructional "tutorial" videos addressing everything from how to play Rockgrass banjo, to how to hide the body. Most importantly, and historically, the DVD also contains the complete unedited multi-track audio files (in universal 16 bit WAV format) for the entire album which the user can mix and remix to their heart"s content in such computer programs as Garage Band, Logic, Pro Tools or iMovie - any program which allows the mixing of WAV files. Even more interesting, in an attempt to keep their girlfriends" ageing mothers from hearing it, a bonus song called "Love Cabin" only appears in raw multi-track form, and must be mixed by the user in order to be heard.