In his 30-year career, Roberto Alagna has sung over sixty roles, from Alfredo, Manrico and Nemorino to Calaf, Radames and Otello (which he sang for the first time at the Chorégies d’Orange in 2014), and from Rodolfo and Don José to Mario Cavaradossi and Werther. He also loves exploring lesser-known pieces through productions, concerts and recordings, such as Massenet's Le Jongleur de Notre-Dame, Le Cid and La Navarraise, Lolo's Fiesque, Alfano's Cyrano de Bergerac, Zandonai's Francesca da Rimini, Chausson's Le Roi Artus and Meyerbeer's L'Africaine.
Two operas have been written for him: Marius et Fanny by Vladimir Cosma and Le dernier jour d'un condamné by David Alagna, staged for the first time at Avignon, France in 2014. Credo, Viva Opéra, Airs de Berlioz, Bel canto, Robertissimo (a double anthology album combining French chansons and operatic arias), Roberto Alagna chante Luis Mariano, Sicilien and Pasión are just some of the numerous albums in his recording catalogue, bearing witness to the musical eclecticism of a highly varied career. His song recital Little Italy, a show paying tribute to his origins and Italian musical culture, has taken him to over fifteen French cities. In June 2014, he sang at the Fez International Festival of World Scared Music (Morocco) with a new show, Mediterraneo, mingling numbers from the operatic, sacred and traditional repertories reflecting a mix of Western, Arabo-Andalusian, Sicilian and Neapolitan influences. He has taken part in events like La Marseillaise, performed on 14 July 2005 at the foot of the presidential stand on the Champs-Elysées, and a concert in the splendid Château de Versailles gardens in 2009, conducted by Michel Plasson. He has also starred in films, including Benoît Jacquot's Tosca in 2001, and Barbara Willis Sweete's Roméo et Juliette in 2007.
He has made an impressive numbers of recordings with Erato, Sony, EMI and Deutsche Grammophon, covering a wide range: complete works, duets, oratorios, recitals of great operatic arias, operas, sacred arias and songs.