1940-1949 - a period of creativity marked by mature symphonic works - writes his two symphonies; a period of time, when he holds key positions at the leadership of the musical life and the organization of musical and artistic amateur activities, and enters the academic world.

1940 - writes the song “A bright star has risen” for a children’s choir.

1941 - on June 29, is elected as a full member of the Bulgarian Academy of Sciences and Fine Arts, following a motion by Dobri Hristov.

1941 - in the month of October, with a Czar’s decree, is appointed Director of the National Opera, Deputy-Director of the National Theater, and Chairman of the State Philharmonic Orchestra (he holds these position until the month of October, 1944).

1943 - in the month of September, the National Opera in Sofia stages “Fairy tale” and “Thrace” as one-act ballets; libretto by Mariya Dimova, choreography by Mariya Dimova, with Asen Naidenov as conductor and Dechko Ouzounov as scene-painter.

1945 - in the month of July, finishes his First Symphony, in A-minor.

1946 - on Aug. 10, the premiere takes place of the First Symphony, performed by the State Symphony Radio-Orchestra at the Radio-broadcasting Directorate, conducted by Asen Naidenov.

1946 - appointed as an adviser on musical problems at the Ministry of Information and Propaganda, a position he holds until 1948.

1947 - writes the songs: “A May Day song”, for a single or mixed choir, on lyrics by Ivan Davidkov; “Autumn song”, for two voices, lyrics by N. Monev; and “Little moon”, for two voices, lyrics by K. Velichkov.

1948 - appointed as an adviser I-category on musical problems at the Committee for Science, Fine Arts and Culture.

1948 - elected as a member of the Arts Council at the Central Labor-Union House “G. Dimitrov” of the United Labor Professional Unions.

1948 - elected as a member of the Arts Council at the Sofia City Committee of the Fatherland’s Front.

1948 - writes the songs: “Motherland”, for a single choir, lyrics by K. Shishkov; and “A night march”, for two voices, lyrics by Tsv. Angelov.

1948 - entrusted with the organization of an Institute for Music with a Museum at the Bulgarian Academy of Sciences.

1948 - in the month of November, completes the Second Symphony, in C-minor.

1948-1949 - works actively towards the establishment of provincial state symphonic orchestras and state opera theaters.

1949 - writes the songs: “First night”, for three voices, lyrics by Iv. Davidkov; and “Stalin’s holiday”, in folklore style.

1949 - on Oct. 4, the premiere of the Second Symphony is held, performed by the Sofia State Philharmonic Orchestra, conducted by Sasha Popov.

1949 - elected Chairman of the Amateur Artistic Activities Council at the Sofia People’s Council.