=== "Master of Reality" and "Volume 4" (1971–73) ===In February 1971, after a one off performance at the Myponga Pop Festival in Australia, Black Sabbath returned to the studio to begin work on their third album.
=== "Master of Reality" и "Volume 4" (1971—1973) ===В феврале 1971 года Black Sabbath вернулись в студию и приступили к работе над третьим альбомом.