Released in November 1971, Led Zeppelin IV - which is officially untitled - became one of the most artistically influential and commercially successful albums, one which defined the sound of rock music for a generation with ubiquitous anthems such as “Stairway To Heaven,” “Rock And Roll,” “Black Dog,” and “When The Levee Breaks.” The album was inducted into the Grammy Hall of Fame in 1999, has been certified 23x platinum by the RIAA.