Here's eight things we still can't believe happened at the Back to the Beginning Concert. Other than the fact we can't believe that two of us at Loudwire made it out to Birmingham for this historic event, there's more than a handful of particular moments and things in totality that really are mind-blowing.

Ozzy Osbourne's all-star farewell concert on Saturday, dubbed Back to the Beginning, featured Metallica and Guns N' Roses, who paid tribute to Osbourne and the original Black Sabbath at what was billed as their final show in Birmingham,

A list of five rock bands who would be great guests of honor at an Ozzy Osbourne-styled Back to the Beginning' tribute show.

And while it was an important moment for all of us, it was an equally important moment for a number of houses and hospitals in the Birmingham area, as it turns out the event generated nearly $200 million for those causes.

"This might be the greatest one-day lineup in the history of rock," says Billy Corgan of the event celebrating the band and Ozzy Osbourne's final show.

Guns N’ Roses Back to the Beginning concert was nothing short of spectacular. The band performed a six-song set at Ozzy Osbourne’s farewell show, which included four Black Sabbath covers.

Nearly every rocker that took the stage at Ozzy and Black Sabbath's farewell performance had something to say about them afterward.

Back to the Beginning was nothing short of monumental for metalheads like me. It was a ‘who’s who’ of the rock and metal scene, with countless artists joining forces to pay tribute to the founding fathers of the genre as we know it.