What role do "phrases" play in the organization of a musical piece?

Phrases play a crucial role in the organization of a musical piece by dividing the composition into digestible parts. They act similarly to sentences in written language, providing a sense of structure and clarity. Each phrase typically expresses a musical thought or idea, allowing musicians and listeners to process the music in manageable segments. This division helps to create a sense of flow and coherence within the larger piece, ensuring that the audience can follow the development of the music over time.

In contrast, the other options involve misunderstandings about the function of phrases. While phrases may contain melodic content, they are not solely responsible for this aspect, as they exist within the broader context of musical structure. Establishing the tempo is not a function of phrases but rather of the overall musical direction and metrical organization. Additionally, phrases are a fundamental element found across various genres and forms of music, not limited to just choral works. They provide versatility in both instrumental and vocal music across diverse styles.