They say music comes from the soul, but we're not sure what part of Robb Flynn's aching, recuperating body that his determination comes from. The Machine Head vocalist is making good on his promise to rejoin the band's trek with DethklokAll That Remains andBlack Dahlia Murder before its conclusion, revealing they'll be back on the bill as of this Saturday (Nov. 24) in Portland, Ore.

Flynn recently had emergency surgery to deal with a hernia, and missing dates is not something that Machine Head are accustomed to. The group bowed out of the trek and missed a total of nine dates while the singer recovered.

Since the need for the surgery happened while the band was on tour, Flynn initially spent part of the recovery process in a hotel room. He documented the aftermath of the surgery in a pair of video diaries that he shared with fans.

The singer recently arrived back in the Bay Area where he was able to spend the last few days recuperating at home with his family. Flynn says the experience "totally sucked balls," but that he is "feeling stronger now, especially after a heavy listening schedule of Accept's 'Balls to the Wall,' AC/DC's 'Big Balls'." He adds, "Hell, I even found time to record a cover of Soulfly's 'Eye for an Eye,' with the lyrics changed to 'Guts in the Nuts.' Guts in da nuuuuuuts, guts in da nuts, in da nuts, in da nuts.'"

For the remaining dates on the Dethklok-Machine Head-All That Remains-Black Dahlia Murder trek, be sure to click here.