Marcel "Marc" Dietrich is a Swiss singer and musician. Together with Peter Reber and Sue Schell as part of the trio Peter, Sue & Marc, he represented Switzerland 4 times in 10 years.
The trio performed Les illusions de nos vingt ans at the 1971 contest in Dublin finishing 12th and becoming the first group to perform at Eurovision under a new rule where groups of no more than six people were allowed on stage. In 1976 in The Hague, they finished 4th with the song Djambo, Djambo.
Three years later, they appeared at the 1979 contest in Jerusalem performing the song Trödler und Co with trash musicians Pfuri, Gnorps and Kniri, and finished 10th. Their last appearance together brought them full circle to Dublin at the 1981 contest with the song Io senza te, matching their 4th-place finish from 5 years earlier.
| Eurovision Song Contest 1971 | |||
|---|---|---|---|
| Participants | |||
 Marianne Mendt •  Joe Grech •  Séverine •  Peter, Sue & Marc •  Katja Ebstein •  Karina •  Serge Lama •  Monique Melsen •  Clodagh Rodgers •  Lily & Jacques •  Massimo Ranieri •  Family Four •  Angela Farrell •  Saskia & Serge •  Tonicha •  Krunoslav Slabinac •  Markku Aro & Koivistolaiset •  Hanne Krogh
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| Songs | |||
| Musik • Marija l-Maltija • Un banc, un arbre, une rue • Les illusions de nos vingt ans • Diese Welt • En un mundo nuevo • Un jardin sur la terre • Pomme, pomme, pomme • Jack in the Box • Goeiemorgen, morgen • L'amore è un attimo • Vita vidder • One Day Love • Tijd • Menina do alto da serra • Tvoj dječak je tužan • Tie uuteen päivään • Lykken er
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| Eurovision Song Contest 1976 | |||
|---|---|---|---|
| Participants | |||
Brotherhood of Man • Peter, Sue & Marc • Les Humphries Singers •  Chocolate Menta Mastik • Jürgen Marcus • Pierre Rapsat • Red Hurley • Sandra Reemer • Anne-Karine Strøm •  Mariza Koch • Fredi & The Friends • Braulio • Al Bano & Romina Power • Waterloo & Robinson • Carlos do Carmo • Mary Cristy • Catherine Ferry • Ambasadori
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| Songs | |||
| Save Your Kisses for Me • Djambo, Djambo • Sing Sang Song • Emor Shalom • Chansons pour ceux qui s'aiment • Judy et Cie • When • The Party's Over • Mata Hari • Panaghia Mou, Panaghia Mou • Pump Pump • Sobran las palabras • We'll Live It All Again • My Little World • Uma Flor de Verde Pinho • Toi, la musique et moi • Un, Deux, Trois • Ne mogu skriti svoju bol
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| Eurovision Song Contest 1979 | |||
|---|---|---|---|
| Participants | |||
Manuela Bravo • Matia Bazar •  Tommy Seebach • Cathal Dunne • Katri Helena • Laurent Vaguener • Elpida • Peter, Sue & Marc ft. Pfuri, Gnorps & Kniri • Dschinghis Khan • Gali Atari & Milk and Honey • Anne Marie David • Micah Marah • Jeane Manson • Xandra • Ted Gärdestad • Anita Skorgan • Black Lace • Christina Simon • Betty Missiego
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| Songs | |||
| Sobe, sobe, balão sobe • Raggio di luna • Disco Tango • Happy Man • Katson sineen taivaan • Notre vie c'est la musique • Sokrati • Trödler und Co • Dschinghis Khan • Hallelujah • Je Suis L'Enfant Soleil • Hey Nana • J'ai déjà vu ça dans tes yeux • Colorado • Satellit • Oliver • Mary Ann • Heute in Jerusalem • Su canción
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| Eurovision Song Contest 1981 | |||
|---|---|---|---|
| Participants | |||
Marty Brem •  Modern Folk Trio & Aysegül • Lena Valaitis • Jean-Claude Pascal • Hakol Over Habibi • Tommy Seebach & Debbie Cameron • Seid Memic • Riki Sorsa • Jean Gabilou • Bachelli • Linda Williams • Sheeba • Finn Kalvik • Bucks Fizz • Carlos Paião • Emily Starr • Yiannis Dimitras •  Island • Peter, Sue & Marc • Björn Skifs
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| Songs | |||
| Wenn du da bist • Dönme Dolap • Johnny Blue • C'est peut-être pas l'Amérique • Halayla • Krøller eller ej • Lejla • Reggae OK • Humanahum • Y sólo tú • Het is een wonder • Horoscopes • Aldri i livet • Making Your Mind Up • Playback • Samson • Feggari Kalokerino • Monika • Io senza te • Fångad i en dröm
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