Let's see. You're Slash, and you've got six weeks off before the next leg of your tour in support of 'Apocalyptic Love.' Do you spend that time recharging your batteries by resting on some beach somewhere, or do you grab your guitar and jam with one of your idols? For the real Slash, there's really only one answer, isn't there?

The former Guns N' Roses guitarist is currently sitting in on select dates with the Ozzy Osbourne & Friends Tour, which is currently working its way through Europe. Also on stage with Slash and Ozzy are Black Sabbath bassist Geezer Butler and longtime Ozzy guitarist Zakk Wylde. Other unnamed special guests are also expected to join the tour at various stops.

The Ozzy Osbourne & Friends Tour was originally scheduled to be Black Sabbath's reunion tour, but Tony Iommi's battle with lymphoma forced the change. Instead, Black Sabbath will only play at the Download Festival in Leicestershire, England this Sunday (June 10) and Lollapalooza in Chicago on August 3. Black Sabbath also played a warm-up show three weeks ago in their hometown of Birmingham, England, and, according to Ozzy, they have 15 songs written for their new album.

Watch Slash Perform 'N.I.B.' with Ozzy Osbourne & Friends in Malmo, Sweden