Since then, he was mainly known as a piano accompanist for other musicians in Europe and America, including his wife and the violinist Eugène Ysaÿe.

[2] During the years at the American Conservatory, many musicians have benefitted from his teaching, including Jane Pickens Hoving,[3] Jane Hobson,[4] Ulvi Cemal Erkin,[5] Humberto Viscarra Monje,[6] Evangeline Marie Lehman[7] and others.

Only about ten short vocal pieces with piano accompaniment or piano solo pieces are attributed as Decreus's compositions.

[9] A number of composers dedicated works to Decreus, including:

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