In music theory, a tetrachord is a series of four notes separated by three intervals. In traditional music theory, a tetrachord always spanned the interval of a perfect fourth, a 4:3 frequency proportion-but in modern use it means any four-note segment of a scale or tone row, not necessarily related to a particular tuning system.Wikipedia
In your video you are describing a tetrad (like a triad but with four notes) a tetrachord is something different
What you told is absolutely correct and yes street name of tetrad is 7th chord 😀
Yeah thanks I thought this was confusing too perhaps guy should remake his video with correct terms
In music theory, a tetrachord is a series of four notes separated by three intervals. In traditional music theory, a tetrachord always spanned the interval of a perfect fourth, a 4:3 frequency proportion-but in modern use it means any four-note segment of a scale or tone row, not necessarily related to a particular tuning system.Wikipedia
Tetragrammaton/Tetractys is the Tetrachord
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this is very cool, thanks
Stranger things at the beginning