Throughout his career, he has appeared in numerous productions recorded for DVD and broadcast internationally. He has worked with conductors including Zubin Mehta, Fabio Luisi, Yannick Nézet-Séguin, Trevor Pinnock, Robin Ticciati, Daniele Gatti, Roberto Abbado, Ivor Bolton, Ottavio Dantone, Daniele Callegari, Bruno Campanella and Ádám Fischer, and with stage directors such as Sir David McVicar, Robert Carsen, Claus Guth, Christof Loy, Emilio Sagi, Barrie Kosky, Francisco Negrín, Stephen Lawless, Harry Kupfer, Frederic Wake-Walker and Hans Neuenfels.

Prieto began his career singing leading roles in the Mozart and bel canto repertoire and has gradually expanded into the full lyric tenor repertoire, taking on roles such as Edgardo, Don José, Pinkerton, Ruggero, Rodolfo, Werther, Gabriele and the Duke of Mantua. Recent seasons have marked a particularly significant stage in this development. He has enjoyed considerable success as Don José in Carmen, which is becoming one of his signature roles, with performances at ADDA in Alicante, with the Stavanger Symphony Orchestra at Stavanger Concert Hall, and at Opera Ballet Vlaanderen. He also earned considerable acclaim for creating the title role in the world premiere of El caballero de Olmedo at Teatro de la Zarzuela in Madrid. Other recent highlights include Nemorino in L’elisir d’amore at ABAO Bilbao Opera, Ferrando in Così fan tutte in Tokyo, Narraboth in Salome at Teatro dell’Opera di Roma, Alfredo in La traviata at Astana Opera, Cassio in Verdi’s Otello at the Opéra national du Rhin in Strasbourg, and Camille de Rosillon in The Merry Widow at the National Centre for the Performing Arts in Beijing.