Gallos studied law at the University of Vienna, and voice at the Municipal Conservatory. He sang first in an academic
amateur male choir, then professionally in the choir of the Vienna Volksoper (1908–12), then from 1915 as a soloist at
the Vienna Hofoper (which soon became the Staatsoper). He spent his entire career there, until 1956. He was also a regular
guest at the Salzburg Festival from 1922 to 1950, and a much appreciated concert singer.
In opera, he sang exclusively comprimario parts: Scaramuccio, Valzacchi, Jacquino, Pedrillo, Don Curzio and Don Basilio,
Monostatos, Rodrigo, Borsa, Altoum, Goro, Spoletta, Spalanzani, Remendado and many more. From 1937, he was also a professor
at the Vienna Academy of Music.
Reference: Kutsch & Riemens
Picture source: Bildarchiv Austria
