Paralexical

Aural communication includes spoken words and paralexical sounds (groans, screams, whimpers); sound effects (wind, a car starting up and driving away); and music.

Source: wiktionary

The actual reading of the text itself is accompanied by certain common paralexical and extratextual features. The paralexical features are the intonational contours and stress patterns given the oral reading.

Source: wiktionary

But the conventional nature of rhyme and metre, their essential arbitrariness, points to the fact that they themselves are also signifiers, albeit paralexical and to some extent parasyntactic.

Source: wiktionary

Gervinus speaks here not of literal music, but of those paralexical attributes of speech that often convey more emotion than words — intonation, pitch-level, volume, tempo, etc. […] Mussorgsky clearly desired to reduce the formal lexical content of the play to a bare minimum, leaving the greater room for paralexical play, that is, the "musical" qualities of speech.

Source: wiktionary