James Hetfield and Kirk Hammet of Metallica performing live on stage at the O2 Arena. London, England - 02.03.09

The rockers played a 13-song set as part of the Guitar Hero: Metallica showcase, performing some of their greatest hits including For Whom The Bell Tolls and Seek & Destroy.

Only 2,100 fans were allowed in to the show at Stubb's Bar-B-Q, which was guarded by a dozen police officers and 75 security guards, according to Keyetv.com.

Source: WENN