They were active (with a few interruptions) from 1964 until 1985 and had their most successful period from 1968 until 1975.
Of the many hits the band had at home and abroad, the biggest one is "One Way Wind", which was released in 38 countries and a top ten number in several of them, of which it was a number one in Switzerland. In Germany it sold more than a million copies. The song has been covered by some 150 other artists. The number was written by Arnold Muhren, bass-player and chief composer.