It’s not a parody. Def Leppard got pissed at their record label and used a clause in their contract to prevent the label from issuing any digital versions of their songs. They actually re-recorded their hits and sold them direct and licensed them for video games. The feud has been going on for years. http://www.blabbermouth.net/news/def-leppards-catalog-may-finally-come-to-spotify/