Torry improvised a wordless melody to accompany Wright's emotive piano solo. Scat singing is vocal improvisation with wordless vocables, nonsense syllables or without words at all. The band also sings wordless vocals in harmony. The track features guitar feedback, a percussion solo section and wordless vocals. His voice is also present in a wordless chorus. Among his most popular songs is the wordless "Vocalise". The others communicate through pantomime or wordless sounds. Slave girls dance to a wordless choral version of "Greensleeves". Wordless, emotional melodies, "nigunim", are particularly common in their services. The song was demoed as a wordless chorale. Many of the songs are instrumental or feature wordless vocals. The chorus progression was written by guitarist David Gilmour, who recorded a wordless demo. Lewis Porter calls it a "wordless recitation". In most versions, the discourse of the text culminates with a wordless teaching of silence. However, "Disco Suicide" also contains vocals, albeit wordless and syllabic.