 The group is known for representing the Netherlands in the Eurovision Song Contest 1970 and Belgium in the Eurovision Song Contest 1977.The sisters Maessen started their career in 1969 as backing vocalists for Dutch singer Rob de Nijs at the "Nationaal Songfestival", the Dutch national selection for the Eurovision Song Contest, performing the song "Zaterdagavondshow".Shortly after, the group released their debut single "Oh What a Price", followed by their debut album "Hearts of Soul" later that year.