His legacy consists of a series Musica: solo pieces some with accompaniment, some solo; and of a series Canto: large scale works for chamber ensembles and orchestras.
The style of Wissing's music can be described as moderately modern or Neo-Romantic. He had been using long melodic lines in a basically modal world, his harmonies are built on fourths. The orchestration of Wissing's music is refined and powerful. Influences on his melodic style have been traced back to Carl Nielsen and Leoš Janáček, while the orchestration of Wissing is influenced by Gustav Mahler, Dmitri Shostakovitch and Richard Strauss. [citation needed]