Metallica's biggest concert ever was on August 29, 1992 at Tushino Airfield in Moscow, Russia. There were an estimated 1.6 million people in attendance, making it the largest rock concert in history at that time. The band played for over three hours, with a setlist that included fan favorites such as "Enter Sandman," "Sad But True," and "Wherever I May Roam." Metallica was joined onstage by several guest musicians, including Slash from Guns N' Roses and Ozzy Osbourne. The concert was widely considered to be a watershed moment for heavy metal music, as it showed that the genre could be popular in countries outside of North America and Europe.