. >>> greg allman has been making music for over four decades but all of those years of life on the road with him. in today's human factor, dr. sanjay gupta gives us a peek into his battle with hepatitis c and liver cancer. >> rules of the day were don't mess with my wife, don't sit on my harly and do not mess with my -- ♪ >> reporter: rock legend greg allman the good old days were filled with great times and great music, a lot of this at the big house in make con, georgia. >> we thought we should go find us a big huge house, what we called a big huge hippie crash pad. >> reporter: today that big house is a museum, a testament to the allman brothers band. >> every time i look somewhere it brings back a different memory. big tour. >> reporter: he is here for more than a stroll down memory lane, he's taping a public service announcement for merck about hepatitis c, he says he got after years of heavy partying and riskky behavior. >> they think i may have got it from an early tattoo. >> reporter: he wasn't diagnosed until more than a decade later. >> i started to get real tired and energy a