Question: What nationality is the performer of song Cowboy Yodel Song?
Sentence (from "Wanda Jackson"): Wanda Lavonne Jackson (born October 20, 1937) is a retired American singer, songwriter, pianist and guitarist who had success in the mid-1950s and 1960s as one of the first popular female rockabilly singers, and a pioneering rock-and-roll artist.
Relevant evidence: Yes