In who was the leader in black sabbath?

Ozzy Osbourne was the lead vocalist of the heavy metal band Black Sabbath. He joined the band in 1968 and sang on their first six studio albums, including classic titles such as "Black Sabbath", "Paranoid", and "Master of Reality". Ozzy's distinct vocal style and charismatic stage presence contributed significantly to the band's success and recognition as one of the pioneers of heavy metal music. Despite his eventual departure from Black Sabbath in 1979, Ozzy Osbourne's leadership and impact remain important in the history of the band.