Was the brother of the pianist Pierre Beaudet piano and organ lessons at the Collège de Lévis with Father Alphonse Tardif and then studied at the Séminaire de Québec Henri Gagnon and Robert Talbot. In 1929 he was awarded a Prix d'Europe and studied until 1932 in France, first at the American Conservatory with Pierre Lucas, later at the Conservatoire de Paris with Yves Nat, Marcel Dupré and Louis Aubert.
He then taught at Laval University and was organist at St- Dominique Church in Québec. Between 1935 and 1937 he also appeared with the Société des concerts symphoniques de Montréal ( Montreal Symphony Orchestra ) as a pianist and ( at the invitation of Wilfrid Pelletier ) as a conductor.
From 1937 to 1947 Beaudet was at the CBC in succession program director for the region Québec, program director for the French network and representative of the French network for the Pacific. He conducted for the broadcast of the CBC works such as Hector Berlioz's L' Enfance du Christ, Gabriel Fauré's Requiem, Honegger's Le Roi David and Gabriel Pierné Les Enfants à Bethlehem. Under his leadership, the CBC commissioned from Healey Willan commissions to the operas Transit through Fire ( 1942) and Deirdre of the Sorrows (1945 ).
For the NBC radio series Music of the New World Beaudet conducted under the title Canadian Music in Wartime works by Lucio Agostini, Arthur Benjamin, Frank Blachford, Maurice Blackburn, Alexander Brott, Claude Champagne, Jean Coulthard, Robert Farnon, Robert Fleming, Jean- Josaphat Gagnier, Hector Gratton, Arnold Walter, John Weinzweig, Healey Willan and others.
In 1946 he made his conducting debut in Europe at the Prague Spring with the Czech Philharmonic. 1948-49 he was responsible for the international radio program of the CBC, the series Music and Musicians of Canada, in which he the international public Canadian composers such as Violet Archer, Maurice Blackburn, Alexander Brott, Claude Champagne, Jean Coulthard, Roger Matton, Pierre Mercure, François Morel, Jean Papineau - Couture, Barbara Pentland, Harry Somers and John Weinzweig savant.
From 1947 to 1952 taught at the Conservatoire de musique du Québec, where he led an orchestra class, and at the École Vincent- d'Indy. His most famous students were here Jocelyne Binet, Josephe Dufresne and Elayne Julien. He also appeared as a piano accompanist of Raoul Jobin, Marjorie Lawrence, Ezio Pinza, Georges Thill and Ninon Vallin and a duo of pianist Jeanne Landry. In 1949 he conducted at the Montreal festival a performance of Puccini's Tosca, in a minute he led Milhaud's Le Pauvre Opera Matelot on.
After studying in Paris, he was from 1953 to 1957 director of programming and production of the CBC Radio in Toronto. During this time he conducted the radio and TV program several major international opera composers, including Gabriel Pierné Les Enfants à Bethlehem in 1954, Giacomo Puccini's La Bohème, L' Heure espagnole Maurice Ravel, Claude Debussy's Pelléas et Mélisande and Christoph Willibald Gluck's Alceste in 1955, Bohuslav Martinus Comedy on the Bridge and Jules Massenet's Werther in 1956, Jean -Philippe Rameau's Hippolyte et Aricie, Charles Gounod's Mireille and Georges Bizet Carmen 1957. using the CBC Symphony Orchestra, he played the Canadian premieres of Paul Dukas ' Symphony and Olivier Messiaen Turangalîla symphony.
From 1957 to 1959, Beaudet representatives of the CBC in Paris. Then he was back in Canada until 1964 held various positions at the CBC and appeared as a conductor in on television programs and at the Montreal Festival. From 1964 until his death he was musical director of the National Arts Centre, the permanent orchestra he founded. In 1971, he posthumously received the Canadian Music Council Medal. 1988 donated to the Canada Council by Jean -Marie Beaudet Award for Young Conductors.