What does "accompaniment" typically include in a musical piece?

In a musical piece, "accompaniment" primarily refers to the supporting harmonies provided by other instruments. This role is essential as the accompaniment creates a harmonic foundation that complements the main melody, enhancing the overall texture and depth of the music. It often includes chords and rhythmic patterns that underline the melody, allowing it to shine without overshadowing it. Instruments such as pianos, guitars, or strings typically fulfill this role, providing the necessary support that enriches the listening experience.

The principal melody is not considered accompaniment, as it serves as the main focus of the piece. A vocal line that embellishes the main theme may provide additional interest but does not define the concept of accompaniment. Similarly, contrasting rhythms played by the percussion section might contribute to the overall sound but are typically part of the arrangement's rhythmic or textural elements rather than the harmony that characterizes accompaniment. Thus, the essence of accompaniment lies squarely in its function to support and enhance the melody through harmonic and rhythmic contributions from various instruments.