Anyone who caught one of the Big Four shows over the past couple of years would agree that they were truly once-in-a-lifetime events. As many fans are still hoping the Big Four -- Metallica, Slayer, Anthrax and Megadeth -- will come their way, Slayer's Kerry King believes the bands will likely now go their separate ways.

Soul singer Macy Gray will release a new album of cover songs called Covered on March 27.

In case you missed it (video here,) Dave Mustaine joined Metallica on stage at the Fillmore in San Francisco for five songs on the final night of their 30th anniversary celebration. Mustaine recently talked to Powerline about the show, including his earliest memories of Metallica.

I can't speak for anyone else, but I'd certainly feel pretty good if Jimmy Page went out of his way to shoot a video message to me on my 30th birthday. And that's exactly what the legendary guitarist did for Metallica, along with an impressive list of fellow musicians, including Slash, Aerosmith, Rush, Tom Morello, Slash, Green Day, Sammy Hagar, Rodrigo y Gabriela, Kerry King and more.