Her childhood was shaped by the Spanish Civil War and the modest means of her working-class family. Her musical talent developed early and she was already singing classical cantatas at the age of seven. From 1942 she trained in singing at the Conservatorio Superior de Musica in Barcelona. She was able to study thanks to a scholarship. In 1954 she finished with the best award. The following year, Montserrat Caballé made his debut in Reus, southern Catalonia, in the leading female role in the comic opera "La serva padrona" by the Italian composer Giovanni Battista Pergolesi. She then received a three-year engagement at the theater in Basel from 1956. From 1959 to 1962 she worked at the theater in Bremen. During this time in German-speaking countries, she learned to speak the local language fluently. 1965 was the beginning of her great international career. On April 20th of this year, she briefly replaced her pregnant colleague Marilyn Horne in the opera "Lukrezia Borga" by Gaetano Donizetti, which took place as a concert performance at Carnegie Hall in New York.

Montserrat Caballé was enthusiastically celebrated by the audience, highly praised by the press and mentioned alongside renowned personalities such as Maria Callas and Joan Sutherland. With this event she became a star and the doors of the most important international houses opened to her. Immediately afterwards, the Metropolitan Opera contacted her with a permanent contract. There she started in the role of Marguérite in the master opera "Faust" by the French composer Charles Gounod. This was followed by a record contract with the music label RCA Records in New York City. In 1962 she met her future husband, the tenor Bernabé Marti. This year she appeared with him in the opera production of Giacomo Puccini's "Madame Butterfly" at the Teatro del Liceo in Barcelona. Two years later, the two married in the Benedictine monastery of Santa Maria de Montserrat in the mountains of the same name near Barcelona. From 1971, the soprano performed regularly at the State Opera in Hamburg. Her favorite composers include Rossini, Donizetti, Bellini, Verdi and Puccini. In addition, Caballé often worked as a concert singer.

In 1986, she was diagnosed with a benign brain tumor. She became known to a wider, more operatic audience through her legendary performance on the rock crossover title "Barcelona" on the occasion of the 1992 Olympic Games there, which she sang together with Freddie Mercury and which comes from the 1987 album of the same name. This and other engagements show the versatility of the artist Caballé. The solo title was written by Mercury. Her album "Friends For Life" was released in 1997 with the participation of Bruce Dickinson, Johnny Hallyday, Johnny Logan, Gino Vannelli and Helmut Lotti. A year later, Caballé was awarded the Bambi. The singer celebrated her comeback as an opera diva in 2002 at the Gran Teatro des Liceo in Barcelona after ten years away from the stage. In 2007 she was awarded the Echo Klassik Music Prize for her life's work. In the same year on April 1st she returned to the stage of the Vienna State Opera after 18 years. She played and sang the role of Duchesse de Crakentorp in Gaetano Donizetti's opera "La Fille du Régiment", an international production between the Vienna State Opera, the Royal Opera House Covent Garden and the Metropolitan Opera New York.

The diva's other awards include the Order of Doña Isabel La Católica as the highest title of the Spanish government, R.SH Gold for pop music from Radio Schleswig-Holstein, the Federal Cross of Merit of the Federal Republic of Germany and the French Cross of Honor for Arts and Science. Montserrat Caballé also volunteers as a United Nations ambassador. With her excellent bel canto interpretations, she is one of the greatest singers in the field and its innovators. In addition to her exceptional artistic qualities, her more than 90 opera roles and her around 4,000 performances made her popular as one of the greatest opera singers. In addition to the opera stage and musical theater, she delighted audiences with her heartwarming appearances in talk shows, galas and film documentaries.