Kalman Felberbaum (30 July 1923[1] – 21 December 2018) was an operatic bass singer who enjoyed an international career using the professional/stage name Carlos Feller.
He appeared at the London Sadler's Wells Opera in 1958, in Cimarosa's Il maestro di cappella, and at the Edinburgh Festival as Dr. Bombasto in Busoni's Arlecchino.
At the Salzburg Festival, he appeared in 1969 as Uberto in Pergolesi's La serva padrona, in 1979 as Dr. Bartolo in Le nozze di Figaro, in 1982 as Don Alfonso, and in 1984 as the notary in Der Rosenkavalier by Richard Strauss.
[1] In 1988, Feller made his debut at the Metropolitan Opera, New York City, as Don Alfonso,[3] regarded as his signature role, and returned in 1990 as Dr. Bartolo in Rossini's Il Barbiere di Siviglia.
[1] Performances are available on video as Dr. Bartolo (again both Rossini's, and Mozart's), Geronimo in Cimarosa's Il matrimonio segreto and Bardolfo in Salieri's Falstaff from the 1995 Schwetzingen Festival.