- Great granduncle of Alexy Bosetti.
- André Hornez was the godfather and Paulette Coquatrix was the godmother of his daughter Monique Betti in 1950.
- He studied music at the Conservatoire de Paris in the same harmony class as Louiguy and then they both composed the music for two romantic songs with lyrics by Édith Piaf which were performed by Yves Montand : "La Vie en Rose" for Louiguy in 1946 and "Mais qu'est-ce que j'ai" for Henri Betti in 1947. These two songs have been adapted into English in 1950 : "La Vie en Rose" by Mack David with the same title and "Mais qu'est-ce que j'ai" by Harold Rome with the title "What Can I Do".
- André Hornez and Bruno Coquatrix were his best man and Henri Betti was the best man of his sister Freda Betti.
- On April 28, 1958, he was one of the seven composers invited to the TV show Les grandes familles de Trente-Six Chandelles : la chanson (1958) hosted by Jean Nohain which was devoted to the successes of the Chanson Française between 1945 and 1955. The composers have played the melody of their favorite song on the piano : Henri Betti for "C'est si Bon" (1947), Louiguy for "La Vie en Rose" (1946), Paul Durand for "Boléro" (1948), Joseph Kosma for "Les Feuilles Mortes" (1946), Louis Ferrari for "Domino" (1949), Paul Misraki for "Tu n'peux pas t'Figurer" (1950) and André Popp for "Les Lavandières du Portugal" (1954).
- Most of his songs have known several versions : "La Chanson du Maçon" (1941), "La Fête à Neu-Neu" (1943), "Le Régiment des Mandolines" (1946), "C'est si bon" and "Mais qu'est-ce que j'ai ?" (1947), "Rien dans les Mains, rien dans les Poches" and "Maître Pierre" (1948), "Les Baobabs" (1949), "Elle Chante" and "Je Cherche un Coeur" (1950), "Toutes les Femmes" (1951), "Le Vrai Mambo" (1952), "Deux Amoureux sur un Banc" (1954) and "C'est Noël" (1956).
- In Honoré de Marseille (1956), Fernandel sings three songs composed by Henri Betti with the lyrics by Jean Manse. They had written a fourth song for the movie, "C'est Noël", sung by Fernandel in a scene that was deleted at the editing. So it appears only in the record released the same year with the other three songs of the film ("Tout ça c'est Marseille", "Quel plaisir ! Quel travail !" and "Oh ! Honoré") all orchestrated by Paul Bonneau. "C'est Noël" is recorded the same year by Tino Rossi with Pierre Spiers and his Orchestra and by Georges Guétary with Jo Moutet and his Orchestra.
- In September 1947, he offered to Yves Montand singing two songs he has composed : "Mais qu'est-ce que j'ai ?" (lyrics by Édith Piaf) and "C'est si bon" (lyrics by André Hornez). Yves Montand recorded "Mais qu'est-ce que j'ai ?" with Jean Marion and his Orchestra but not "C'est si bon". After the success of the recording of "C'est si bon" by Les Soeurs Étienne with Raymond Legrand and his Orchestra, he decided to record it. He recorded the song in May 1948 with Bob Castella and his Orchestra.
- Buried with his wife Françoise Engels in the old cemetery of Neuilly-sur-Seine (Hauts-de-Seine).
- In 2006, his son François Betti wrote the musical engraving and the comments from the songbook "Une Vie en Chansons" which contains 12 songs composed by Henri Betti. The songbook is published by "Paul Beuscher" which was the music publisher of "C'est si bon" in 1947.
- He composed the music for thirteen songs with another composer : "Pour l'Amour" with Paul Bonneau (lyrics by Pierre Dudan), "Le Chant des Guerriers", "On Dit que Paris" and "Rapsodie Antique" with Jacques Brienne (lyrics by André Hornez), "Avec" and "Paris mes Amours" with Bruno Coquatrix (lyrics by André Hornez), "Il Fait Beau", "Si j'Étais Marin" (lyrics by Jacques Mareuil), "La Vie ce n'est qu'un Cirque", "Le Flambeau de l'Amour", "Oh La La", "Rapsodie Antique" and "Si tu Voulais m'Aimer" with Jean-Pierre Landreau (lyrics by André Hornez) and "L'Auberge Fleurie" with Rolf Marbot (lyrics by Francis Lopez and André Salvet).
- Five of his songs have been adapted into English : "C'est si bon" (by Jerry Seelen in 1949), "Mais qu'est-ce que j'ai ?" (by Harold Rome in 1949 with the title "What Can I Do ?"), "Maître Pierre" (by Mitchell Parish in 1951 with the title "The Windmill Song"), "Deux Amoureux sur un Banc" (by Ben Smith in 1955 with the title "A Boy And A Girl") and "Donnez-moi tout ça" (by William Engvick in 1956 with the title "Give Me More").
- In 2018, the mayor of Nice Christian Estrosi gave the name of Henri Betti to a square located in the Vieux-Nice district (rue Saint-Joseph) where he was born in 1917.
- On April 28, 2018, Benoît Duteurtre hosts his radio show "Étonnez-moi Benoît" about his career with the participation of the composer's son and grandson : François Betti and Olivier Betti.
- In 2016, he was portrayed by Samuel Schall in the play "Defendant Maurice Chevalier" which was written by Alexis Chevalier and directed by Alexander Notkin.
- Jean Rodor was his godfather at the Sacem.
- It was while watching Leise flehen meine Lieder (1933) in the cinema that he decided to become a music composer.
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