Define "non-lexical" vocables in music.

Non-lexical vocables refer to syllables or sounds used in music that do not have specific meanings. These are often employed in vocal music to create a certain mood or texture without the constraint of language and its meanings. For example, singers might use "la," "da," or "oo" as a way to focus on melody, rhythm, and harmony rather than lyrics. This technique allows for creativity in vocal expression and can enhance the emotional impact of a piece by emphasizing the musicality of the voice rather than its verbal content.

In contrast, sounds that have specific meanings in singing directly connect to words or ideas, and therefore qualify as lexical. Pitching variations in vocal performance relate more to the control of pitch and tone rather than the use of non-meaningful sounds. Musical notes played without lyrics focus on instrumental compositions where lyrics are absent, which does not align with the concept of non-lexical vocables as they are specifically linked to vocal sounds.