Heart is an American rock band which first found success in Canada and later in the United States and worldwide. Over the group's four-decade history, the band has had three primary lineups, with the constant center of the group since 1974 being sisters lead singer Ann Wilson and guitarist Nancy Wilson. Heart rose to fame in the mid-1970s with music influenced by hard rock and heavy metal as well as folk music. Their popularity declined in the early 1980s, but the band enjoyed a comeback starting in 1985 and experienced even greater success with album oriented rock (AOR) hits and hard rock ballads into the 1990s. With Jupiter's Darling (2004), Red Velvet Car (2010), and Fanatic (2012), Heart made a return to their hard rock and acoustic folk roots.