He often performed opposite his close friend Enrico Caruso and appeared with the illustrious tenor when he made his Met debut as the Duke of Mantua in " Rigoletto" in 1903. Scotti partnered 15 different Toscas over the course of his long career at the house. In 1912, Scotti's arrival in the United States with Pasquale Amato and William Hinshaw for his next Met season received extensive newspaper coverage. He performed at the Royal Opera House, Covent Garden, on a regular basis until 1910, with additional appearances in the 1913–1914 season. During this period, he became not only London's first Scarpia but also its first Sharpless in Puccini's "Madama Butterfly" (in 1900 and 1905 respectively), which he also introduced to the Met in 1907. In 1917, he was elected an honorary member of Phi Mu Alpha Sinfonia, the American fraternity for male musicians, at the New England Conservatory of Music. Scotti performed in Paris at the Opéra Comique singing "Tosca" (in 1904 with Emma Eames and Emilio De Marchi, conductor Cleofonte Campanini, and in 1910, with Farrar and Beyle, the young and later-prominent conductor Gino Marinuzzi). In 1910 at Theatre du Châtelet with the Metropolitan ensemble, Scotti sung Falstaff conducted by Arturo Toscanini and at the Opera, in a gala performance, the third act of "La bohème" with Caruso and Farrar. In 1908, he sang at Salzburg in "Don Giovanni", with Lilli Lehmann (Donna Ana), Johanna Gadski (Donna Elvira), Geraldine Farrar (Zerlina), with Karl Muck conducting. He formed his own troupe of singers in 1919, calling it, naturally enough, the Scotti Opera Company. He managed it for several seasons while touring the United States. Scotti celebrated his 25th anniversary with the Met on 1 January 1924 in a gala performance of "Tosca". By the 1930s, Scotti's voice had declined considerably but he retained his place on the Met's roster of singers due to his outstanding histrionic ability. His final Met appearance occurred on 20 January 1933, when he sang Chim-Fen in "L'Oracolo"; he had created the role in 1905. Scotti returned to Italy to spend his retirement.