"Live… Gathered in Their Masses" captures Black Sabbath during their 2013 tour in support of the album "13," which was released that same year. This marked a significant moment in the band's career, as "13" was their first studio album featuring original frontman Ozzy Osbourne since "Never Say Die!" in 1978. The live recording reflects a triumphant return for the band, showcasing their classic heavy metal sound and powerful stage presence, while also highlighting their ability to connect with both longtime fans and a new generation of listeners. Interestingly, this concert was filmed in Melbourne, Australia, and features a setlist that includes iconic hits like "Iron Man" and "Paranoid," demonstrating the enduring impact of their music across decades. The reunion with Ozzy reunited the classic lineup, sparking excitement in the metal community and solidifying their legacy as pioneers of the genre.