Riavez studied in Görz an Laibach, then in Vienna with Franz Schreker und H. Graedener.
He made his debut in 1916 at the Zagreb Opera as Sänger in Rosenkavalier, where he stayed until 1926.
During that time, he made guest appearances in Belgrade and Laibach (Ljubljana).
In 1926, he made guest appearances in Berlin, including the Kroll, and was a member of the Deutsche Oper Berlin during 1927-29
(where he sang in following premieres: Cavalleria rusticana (Turiddu, September 15, 1927),
Die Nachtigall (By Strawinskij, Fischer, December 16, 1927), L´amore dei tre Re (Avito, May 11, 1928), Madama Butterfly (Pinkerton,
June 8, 1928), Fedora (Loris on January 22, 1930 a.G).
During 1931-32, he made guest appearances in Vienna (Staatsoper, Carmen on January 7, 1932 and Manon on November 20, 1931), and starting in 1931, he sang regularly
at the Teatro Colón (Lakmé, Walther,
in Buenos Aires.
During 1932-37, he was a member of the German Opera in Prague (Il Trovatore).
He sang in 1927 in Dresden and in 1929 at the Nationaltheater in Prague.
He gave concerts in Paris (1929), Hamburg (1936, 1937), Copenhagen (1932), and Budapest. He also appeared
in Symphonic concerts (9. Sinfonie, Verdi-Requiem, Lied von der Erde).
He returned to Yugoslavia and sang for antoher 10 years in Zagreb, Belgrade and Ljubljana.
He taught singing, starting in 1948 at the Conservatory in Belgrade, among his students were: Cvejic, Biserka, (November 5, 1928 Krilo-Jesenice- ),
Miljakovic, Olivera (April 26, 1934 Belgrade - ) and Polic, Inca (September 28, 1925 Zagreb - ).
His son Mario Rijavec (1911 - ) was a conductor.
with Ignjat Bortnik, Ivan Levar, Rudolf Bukek, Irma Polak, Hinko
Reference: Kutsch & Riemens
Reference for the Deutsche Oper: Detlef Meyer zu Heringdorf: Das Charlottenburger Opernhaus von 1912 bis
1961, Bd.2, Berlin 1988, given by Guido Bathe.