Black Sabbath在1972年的专辑Black Sabbath, Vol. 4中添加了更多的音乐元素，例如民谣作品"Changes"中使用主唱+贝斯+钢琴与mellotron电子键盘为结构，硬式摇滚圣歌"Supernaut" 与"Snowblind"中使 用了弦乐，至今这张专辑仍是公认为他们最成熟的专辑。

by Steve Huey

Black Sabbath, Vol. 4 is just a cut below its two indisputably classic predecessors, as it begins to run out of steam -- and memorable riffs -- toward the end. However, it finds Sabbath beginning to experiment successfully with their trademark sound on tracks like the ambitious, psychedelic-tinged, multi-part "Wheels of Confusion," the concise, textured "Tomorrow's Dream," and the orchestrated piano ballad "Changes" (even if the latter's lyrics cross the line into triteness). But the classic Sabbath sound is still very much in evidence; the crushing "Supernaut" is one of the heaviest tracks the band ever recorded.