Gregg Allman, the singer and guitarist for the Allman Brothers Band and progenitor of the blues-inflected genre of Southern Rock, has died at age 69. According to a statement on his official website, Allman died peacefully at home in Savannah, Ga. He had battled health problems for many years, and had undergone a liver transplant in 2010 after a diagnosis of hepatitis C. Michael Lehman, Allman’s longtime manager, called his close friend “a brilliant pioneer in music. He…