Rock singer Joan Jett is an American singer, songwriter, and musician who rose to fame in the 1980s as the leader of the hard rock band Joan Jett & the Blackhearts. She is best known for her hit songs 'I Love Rock 'n' Roll' and 'Crimson and Clover'. Jett has been a major influence on punk rock and heavy metal music and is considered one of the most influential female rock musicians of all time.