In 1921–22 he went to the United States of America to teach composition for a season at the Eastman School of Music in Rochester, New York.

[6] [7] [8] Sinding's publishers required from him piano and chamber music, which had broader sales than the symphonic works he preferred.

The large number of short, lyrical piano pieces and songs that Sinding wrote has led to many seeing him as the heir to his fellow countryman, Edvard Grieg, not so much in musical style but as a Norwegian composer with an international reputation.

He was appointed a Commander of the Order of Vasa and in 1905, he was made a member of the Royal Swedish Academy of Music.

Eight weeks before his death in 1941, Sinding joined the Norwegian Nazi party, Nasjonal Samling - however, his membership card was unsigned.

Following the liberation of Norway at the end of World War II, it was official practice for the national broadcasting system to boycott people seen as Nazi sympathisers.