This s The Seekers

Although it's difficult for those who weren't there to believe, for a short time during late 1965 and early 1966 the popularity of this singing quartet from Australia was sufficient to rival the Beatles and the Rolling Stones. The Seekers were at the head of the British Invasion's acoustic folk-rock division, right there with Peter & Gordon and Chad & Jeremy but without the personal Beatles connection of the former, and more successful than either -- they scored a string of number one hits in England and Top Ten successes in the U.S. that lasted into 1967, two years later than most of the rest of the British-based musical exports to America.
All Music Guide.