The Back Door Wolf is an album by blues musician Howlin' Wolf, released in 1973 by Chess Records. The album features a mix of blues, rock, and soul influences, with Wolf's distinctive vocals and guitar work at the forefront. It includes a number of well-known tracks, such as "Back Door Man," "Wang Dang Doodle," and "Smokestack Lightning."
Flareserif 821 Bold is most probably used for the album title on the cover. It's a commercial font and you can purchase and download it here.