Regeneration: Volume I & II is a compilation album by the band Styx released in 2011. It consists of re-recordings of classic Styx songs, one new track entitled "Difference in the World" and two Damn Yankees covers. The album was released first as two separate EP releases, Regeneration: Volume 1 in 2010 and Regeneration: Volume 2 in 2011. The EPs were sold on every date of Styx's The Grand Illusion/Pieces of Eight tour, which began October 14, 2010 in Evansville, Indiana,[6] and they were sold at some of their concerts since July 2010, as well as on their website. The album was the last Styx studio release with longtime producer Gary Loizzo before his death in 2016.