The Booster series goes on with the 4th volume - a compilation of former Cupdisc tracks, many new tracks and some older tracks with a new livery! Booster IV is highlighted by a newly recorded version of "Alchemy Of The Heart" (from the 1987 album Tyger) as well as "Babylon The Great Has Fallen," "Armageddon In The Rose Garden Part II" and "Purple Diluvial 2010" (re-recorded version) from the rare Purple Diluvial release!