The growing popularity of the genre led groups from other areas to try their hand. These included the Astronauts, from Boulder, Colorado; the Trashmen, from Minneapolis, Minnesota, who reached number four with "Surfin' Bird" in 1964; and the Rivieras, from South Bend, Indiana, who reached number five in 1964 with "California Sun". the Atlantics, from Sydney, Australia, were not exclusively surf musicians, but made a significant contribution to the genre, the most famous example being their hit "Bombora", in 1963. Also from Sydney were the Denvermen, whose lyrical instrumental "Surfside" reached number one in the Australian charts. Another Australian surf band who were known outside their own country's surf scene were the Joy Boys, backing band for singer Col Joye; their hit "Murphy the Surfie" from 1963 was later covered by the Surfaris.