Jesus Christ Superstar is a 1970 rock opera with music by Andrew Lloyd Webber and lyrics by Tim Rice. It started as a rock opera album musical before its Broadway on-stage debut in 1971. The musical is mostly sung-through, with little spoken dialogue. The story is loosely based on the Gospels' accounts of the last week of Jesus' life, beginning with the preparation for the arrival of Jesus and his disciples in Jerusalem and ending with the crucifixion. It depicts political and interpersonal struggles between Judas Iscariot and Jesus that are not present in the Bible. The work's depiction offers a free interpretation of the psychology of Jesus and other characters. Much of the plot centers on Judas, who is dissatisfied with the direction in which Jesus is steering his disciples. Contemporary attitudes, sensibilities, and slang pervade the rock-opera's lyrics, and ironic allusions to modern life are scattered throughout the depiction of political events. Stage and film productions accordingly contain many intentional anachronisms.