William Richard Thorpe, AM (29 March 1946 – 28 February 2007) known as Billy Thorpe, was an English-born Australian singer-songwriter, producer, and musician. As lead singer of his band Billy Thorpe & the Aztecs, he had success in the 1960s with "Blue Day", "Poison Ivy", "Over the Rainbow", "Sick and Tired", "Baby, Hold Me Close" and "Mashed Potato"; and in the 1970s with "Most People I Know Think That I'm Crazy". Featuring in concerts at Sunbury Pop Festivals and Myer Music Bowl in the early 1970s, the Aztecs also developed the pub rock scene and were one of the loudest groups in Australia.