Ulrich Planning More 'Big Four' Shows

The four groups performed on the same bill for the first time in 25 years this summer (10).

The acts' 22 June (10) shows in Sofia, Bulgaria were taped and screened in cinemas around the world, and eventually released on DVD earlier this month (Nov10).

And Metallica drummer Ulrich reveals the groups are already in talks to reunite for another string of shows in the distant future.

Ulrich tells Pulse of Radio, "The vibe on this thing is so big, we'd be stupid to ignore it. You know on your iPhone, you can move the weather maps up and down? Well, the Big Four is quickly moving up to the top in terms of potential occurrences for the next couple of years."