What are the chances of the Big 4 shows multiplying in the near future? Megadeth frontman Dave Mustaine says that's possible, but in the end, it’s all up to the guys of Metallica.

“I'm hoping that after we do the New York trek... we'll come back and do some more dates in the states," he told Metal Underground. “It's totally possible. Is it realistic right now? No. I think you'll have to ask the boys in Metallica about that. I think it's pretty obvious for the three of us that it's a good opportunity for us to play with Metallica.”

Mustaine added that the European shows were killer, and that at one point, Kirk Hammett even asked him to play the solo during a cover of Diamond Head's, "Helpless."

“The bands got along really good. Ticket sales were incredible," Mustaine said. “We planted our flag on top of the planet. If anyone doubted the four of us were the biggest bands in the world, we removed all that doubt.”

Watch Megadeth Perform 'Trust' Live at Big 4 in Sofia, Bulgaria