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- Appassionato might be Legley's opus 1. It is the earliest work he had mentioned in a newspaper article on 26 November 1943.
- See the page early works for a discussion of Legley's (disappeared) youth compositions.
- Anonymous: De Stad Ieper en hare Muziekakademie andermaal aan de eer in Het Ypersche on 26 November 1943, p.2.