They achieved worldwide fame with their international hit songs "Radar Love" in 1973, which went to number one on the Dutch charts, reached the top ten in the United Kingdom, and went to number thirteen on the United States charts, "Twilight Zone" in 1982, and "When the Lady Smiles" in 1984.
During their career they have had nearly 30 top-ten singles on the Dutch charts while releasing 25 studio albums.
Their most popular product. Sold them by the thousands.