Question: Power Balladz, is a live comedy performance featuring a mixture of comedy, trivia, and iconic rock n' roll songs from the 70s, 80s & 90s, the comedy's musical blend includes songs by Heart, a rock band that first found success in Canada and later in the United States and worldwide, are of which nationality ?
Sentence (from "Joan Baez"): Joan Chandos Baez ( ; born January 9, 1941) is an American folk singer, songwriter, musician, and activist whose contemporary folk music often includes songs of protest or social justice, Baez has performed publicly for over 59 years, releasing over 30 albums.
Relevant evidence: No