Swamp Dogg ventured into bluegrass on his new album — “Blackgrass: From West Virginia to 125th St” — because at the age of 81,”I’m gonna really go where I feel,” he says. So, Williams says, “I’m gonna really go where I feel.” “Blackgrass: From West Virginia to 125th St,” Williams’ 26th studio album as Swamp Dogg, continues a renaissance that …
