In the 1920s he travelled to European cities such as Paris, Munich and Berlin, where he received musical inspiration and contacts.

From 1928 to 1943, Brustad was viola soloist with Philharmonic Society Orchestra in Oslo.

[1] He wrote symphonies, compositions for violin and orchestra, chamber music and opera.

[3] After World War II he was also active in organizing work.

[2] As a teacher at the Oslo Conservatory of Music, his students included Bjørn Fongaard[4] and Trond Øyen.