Robert Estrin: What Are Double Stemmed Notes in Music? - From the Music Expert

https://www.virtualsheetmusic.com/experts/robert/what-are-double-stemmed-notes-/ - Ever opened a piece of sheet music and noticed a single note with one stem pointing up and another pointing down? It looks like a printing error, but it’s actually a secret formatting trick used by composers. In this video, Robert Estrin cracks the code on double-stemmed notes, explaining how polyphonic instruments like the piano, violin, and classical guitar use counterpoint to pack an entire choir's worth of music into a single notehead.