 Delius's music is often assumed to lack melody and form.Cardus argues that melody, while not a primary factor, is there abundantly, "floating and weaving itself into the texture of shifting harmony" – a characteristic which Cardus believes is shared only by Debussy.Delius's next work, "Appalachia", introduces a further feature that recurred in later pieces—the use of the voice instrumentally in wordless singing, in this case depicting the distant plantation songs that had inspired Delius at Solano Grove.