Question: Which country the performer of song Rollin' Stone is from?
Sentence (from "Muddy Waters"): McKinley Morganfield (April 4, 1913 April 30, 1983), known professionally as Muddy Waters, was an American blues singer-songwriter and musician who is often cited as the "father of modern Chicago blues", and an important figure on the post-war blues scene.
Relevant evidence: Yes