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 "Heart (band)"): Heart rose to fame in the mid-1970s with music influenced by hard rock and heavy metal, as well as folk music.
Relevant evidence: No