Some guys I jammed with many years ago would sometimes do popular tunes in a punk style. It was pretty fun and our drummer was a bit sloshy in general so it made it less excruciating if we were all just going balls out. e.g. Downtown (Petula Clark) The Weight (The Band) Chains (Carole King via The Beatles) Lyrical mutations are where you slightly change the lyrics of a song. My college roommate changed a few words in Buddy Holly's "Rave On" and it became comically pornographic. A band I mixed sound for in college played Blue Oyster Cult's "Burnin for You" and they always replaced "the devil" with the name of their manager in the line "I'm living for giving the devil his due". Frank Zappa did a ton of this to his own songs, in fact he's the originator of the term "lyrical mutation" as far as I am concerned.