Which Australian pop group were the first to have a "Top 5" hit in Australia, U.K. and U.S.A.?

The Seekers were the first Australian pop group to have a "Top 5" hit in all three countries – Australia, U.K. and U.S.A. Australian music historian, Ian McFarlane described their style as "concentrated on a bright, uptempo sound, although they were too pop oriented to be considered strictly folk and too folk to be rock." The distinctive soprano voice of Durham, the group's vocal harmonies and memorable songs encouraged the British media, including the national broadcasting agency on radio and television, the BBC, to give them exposure, allowing them to appeal to a broad cross-section of the young British folk, pop and rock music audience.

The Seekers were formed in 1962 in Melbourne by Athol Guy on double bass, Keith Potger on twelve-string guitar and Bruce Woodley on guitar. Guy, Potger and Woodley had all attended Melbourne Boys High School in Victoria. In the late 1950s, Potger led The Trinamics, a rock 'n' roll group, Guy led the Ramblers and, with Woodley, they decided to form a doo-wop music group, the Escorts. The Escorts had Ken Ray as the lead singer and in 1962 they became "The Seekers". Ray left the group to get married. His place was taken by Judith Durham, an established traditional jazz singer who added a distinctive female lead voice. She had earlier recorded an extended play disc on W&G Records with the Melbourne group, Frank Traynor's Jazz Preachers.