Which term is similar to a round but involves more complex overlapping of voices?

The term that is similar to a round but involves more complex overlapping of voices is a canon. A canon is a musical form that involves the repetition of a melody in overlapping voices, similar to a round. However, in a canon, the entrances of the melodies can occur at various pitches or intervals, and may involve intricate counterpoints, making it more complex than a simple round where the same melody is sung repeatedly in succession.

A round typically involves singers entering at regular intervals singing the same melody, creating a straightforward texture. In contrast, a canon can feature different melodies based on the same thematic material sung simultaneously, enhancing the harmonic and contrapuntal texture.

Intonation, articulation, and rounds do not capture this complexity of overlapping voices in the same way a canon does, as they refer to different aspects of musical performance or structure. Intonation deals with singing in tune, articulation refers to the clarity of the musical notes, and a round is a basic form of repetition without the same depth of interaction as canons provide. Therefore, the correct answer highlights the unique characteristics of canons in choral music, showcasing their intricate layering and overlapping of melodies.