
Volume 4, Black Sabbath's fourth studio album, released in 1972 marked the beginning of a transitional period for the b&. Black Sabbath were pretty much unique with their sound in the early 1970's; the godfathers of heavy metal were louder than most & had a distinctive sound which no other band really came near to having a similarity to. However, after producing three albums (' Black Sabbath', ' Paranoid' & ' Master of Reality') with their classic, straight out heavy & powerful style, Black