Curated OER
Counterpoint Activities: Listening and Discussion
Students assess whether or not a piece of music is contrapuntal. In this music education lesson, students listen to various pieces of music and identify whether the music is contrapuntal or not contrapuntal.
San Diego State University
Sd State: Elements of Music: Media, Genre, Form Texture
One of the elements of music is "Texture." This site gives the definition, which basically is the relationship between melodic and harmonic.
Wikimedia
Wikipedia: Polyphony
Wikipedia provides a brief description and history of the term, polyphony, including many hyperlinked terms.