I came across a mash-up video on Youtube. It's is Judith Durham singing their hit Georgy Girl, backed up by INXS. So that got me interested in The Seekers and The New Seekers. Here are two wiki entries on the groups:
The Seekers are an Australian quartet folk music-influenced pop music group which was originally formed in Melbourne in 1962. They were the first Australian popular music group to achieve major chart and sales success in the United Kingdom and the United States. They were popular during the 1960s with their best-known configuration as: Judith Durham on vocals, piano and tambourine; Athol Guy on double bassand vocals; Keith Potger on twelve-string guitar, banjo and vocals; and Bruce Woodley on guitar,mandolin, banjo and vocals. The group had top 10 hits in the 1960s with "I'll Never Find Another You", "A World of Our Own", "Morningtown Ride", "The Carnival Is Over" (Russian folk song which the Seekers have sung at various closing ceremonies in Australia, including World Expo 88 and the Paralympics and still stands as the 30th best selling song in the United Kingdom), "Someday One Day", and "Georgy Girl" (the title song of the film of the same name). Australian music historian Ian McFarlane described their style as "concentrated on a bright, uptempo sound, although they were too pop to be considered strictly folk and too folk to be rock."
The New Seekers are a British-based pop group, formed in 1969 by Keith Potger after the break-up of his group, the Seekers. The idea was that the New Seekers would appeal to the same market as the original Seekers, but their music had rock as well as folk influences. They achieved worldwide success in the early 1970s. The group was formed after the disbanding of the successful 1960s Australian group the Seekers. Keith Potger, a member of the Seekers, put together the New Seekers in 1969, featuring Laurie Heath, Chris Barrington, Marty Kristian, Eve Graham and Sally Graham (no relation to Eve Graham). Potger himself also performed and recorded with the group. After one single release, the line-up was reworked in 1970 to Eve Graham, Lyn Paul, Marty Kristian, Peter Doyle and Paul Layton. This line-up found instant success with their debut release, a cover of Melanie Safka's "What Have They Done To My Song, Ma", (titled in the US as "Look What They've Done To My Song, Ma") which became a top 20 hit in the US and a minor one in the UK. http://www.youtube.com/watch?v=PynIN3lWVbk