Ozzy Osbourne's distinctive vocal style, particularly during Black Sabbath's early 1970s albums, is analyzed. His vocals on albums like Vol 4 and Sabbath Bloody Sabbath are highlighted, showcasing his range from desolate wails to gentler acoustics, often complementing Tony Iommi's guitar work. The article also discusses Sabotage and Hole in the Sky, noting Osbourne's ability to convey both ecstatic emptiness and a cult-like devotion in his singing. His performance in Symptom of the Universe is praised for making a weak lyric credible through sheer force of will. The album The Writ is described as showcasing Osbourne’s versatility across various musical styles.

Osbourne's solo career, beginning with the collaboration with Randy Rhoads, marked a stylistic shift. The success of Blizzard of Ozz, featuring the single "Crazy Train," is discussed, emphasizing Rhoads' significant contributions. Diary of a Madman is highlighted as a standout moment illustrating Osbourne's ability to convey darker, empathetic themes without overemoting. Later albums, including The Ultimate Sin and No More Tears, are evaluated, with No More Tears being identified as Osbourne's best since his debut, demonstrating his continued strength and artistic evolution even in the face of evolving musical trends.

Impact Statement: The article offers insight into the evolution of Ozzy Osbourne's vocal style and its interplay with the musicality of Black Sabbath and his solo career, highlighting his lasting impact on heavy metal music.