Peter, Sue & Marc was a Swiss group formed in 1968 consisting of Peter Reber, Sue Schell and Marcel Dietrich. Throughout their career they released over a dozen studio albums, EPs and singles and are best known internationally for representing their home country on four occasions in the Contest, each time singing in a different language, making them their country's most frequent participant.
Their first appearance was in the Eurovision Song Contest 1971 in Dublin with the song "Les illusions de nos vingt ans", which finished in 12th place with 78 points, just a single point behind the entry by Angela Farrell. This appearance also made them the very first group to compete at Eurovision, as 1971 was the first year that groups of no more than six people could appear on stage.
They returned to the Eurovision stage five years later in The Hague with song "Djambo, Djambo", which finished in a respectable 4th place with 91 points, giving the country its best result in six years.
Their third outing, again just three years later in Jerusalem saw them perform with fellow countrymen Pfuri, Gorps & Kniri on the song "Trödler und Co", which finished in 10th place with 60 points.
They made a final appearance as a trio two years later in Dublin with the song "Io senza te", which matched their result five years earlier by finishing in 4th place with 121 points.
They made several more Eurovision attempts, both as a group and individually, with their 1985 appearance in the national final as a group seeing them finish as runner up to "Piano, piano" by Mariella Farré and Pino Gasparini. In 1987 Marc attempted to represent his home as a soloist, finishing as runner up to Carol Rich, while Peter Reber also composed, co-wrote and conducted the country's 1980 entry, "Cinéma" performed by Paola di Medico, making him one of a handful of performers to have participated at the Contest as both a performer and conductor.