Regarded as one of the greatest guitarists of all time, Delta blues wizard Robert Johnson recorded only 29 songs (plus 13 alternate takes, in two sessions) during his 27 years of life. They were cut when he wasn’t playing for tips on street corners, in juke joints or in front of barbershops and other commercial establishments.

Since the guitar's inception, there have undoubtedly been talented players that could make the instrument sing, but it wasn't until the mid '60s and the arrival of the wah pedal that one could make it cry.

Since Paul McCartney started touring regularly in 1989, he's given music fans the closest thing they'd ever see to a Beatles concert. And now that George Harrison has passed away and McCartney's shows packs his concerts with more Fab Four tunes than ever before, the same still holds true.

In the Revolver TV video, Megadeth's Dave Mustaine discusses the band lineup for Gigantour 2013, which kicks off July 3 in New Hampshire and ends August 11 in Toronto.