A fine 10-minute video where musicologist Peter Schubert explains with practical examples (performed by his ensemble) how the motet Sepelierunt Stephanum was constructed. It is an interesting example of how late sixteenth-century imitative counterpoint was set.
From the video’s description: “Marenzio’s motet “Sepelierunt Stephanum” starts with a full-textured phrase, so it’s hard to see how it was composed. In this video, Peter Schubert looks at the beginning of Marenzio’s “Sepelierunt Stephanum,” with the help of some talented singers. The viewer is shown the score and invited to consider how Marenzio might have gone about composing it. As each new phrase is sung, the viewer can pause on the score to study it. Then the singers discuss it and pull out significant pairs of voices to reveal a repeated structural duo and how it is embellished.”