Following several single releases, and a #11 chart hit with "Fat Jack", they took part in the 1970 Dutch Eurovision selection, where their song "Waterman" ("Aquarius") earned a narrow victory, qualifying them for the 15th Eurovision Song Contest, which took place on 21 March on home ground in Amsterdam. Technically, groups of more than two singers were still barred from Eurovision at that time, so to get around this they billed themselves as "Patricia and the ", implying that Stella and Bianca were backing singers to Patricia"s lead. In a small field of 12, "Waterman" placed seventh.
In 1973, the Maessens moved to Belgium where they became in-demand backing vocalists.
Bianca had married a Belgian singer, Luc Smets, and the four decided to form a group called, enjoying immediate success with a single, also called "", which reached #2 on the Flemish chart in 1976. Sung in English, it was a very contemporary track which was widely regarded as one of the favourites for that year"s Eurovision, held in London on 7 May.
Its seventh-place finish of 17 entrants was therefore considered something of a disappointment. Patricia left soon afterwards, and the others carried on as LBS before disbanding in 1981.
She returned in 1982 with the French language song "Si tu aimes ma musique" ("If You Like My Music"), which was successful and went on to the 27th Eurovision in Harrogate, England on 24 April.
Maessen continued performing and recording until 1988, when her last single, "Flashlight", was released.