We have mentioned the Ars Nova. The Italian composer, Jacopo da Bologna wrote in that style. He mostly wrote madrigals, both secular (as in a love song) and sacred; canonic (where the same melody starts at different times in different voices, as in Row, Row, Row Your Boat) and non-canonic; laudat-ballata (sacred but-noncanonical songs, such as Christmas carols) and motets (sacred polyphonic choral pieces meaning, literally, movement of voices against each other). The motet was a rather formal form in the organum tradition of multiple voices over a “cantus firmus,” or plainsong; it marked the beginning of polyphonic music known as counterpoint, i.e., point against point, or melody against melody. Rather than parts that merely harmonizing with the cantus firmus, as the modern Protestant hymn, each part tended to be an interesting melody in itself, hence, “polyphonic.” Despite that, his works often include parallel fifths which would be prohibited at the height of the polyphonic era, such as the music of Bach.
See http://www.youtube.com/watch?v=QlxbuBiRim8&feature=related, which, I assume, is an instrumental rendition of a choral work.
http://www.youtube.com/watch?v=a-FYwWFgesU and http://www.youtube.com/watch?v=Q-75q6AMf3E&feature=fvwrel for choral performances of his works which I believe are secular; but I have been unable to find any sacred examples. However, I did want to include him because of the remarkable contribution he made to the development of counterpoint.
See, also http://www.classicalarchives.com/composer/8861.html for what again appear to be recordings of secular works.
Links to my site:
Home Page https://bibleartists.wordpress.com/