The Nomenclature Of Music: What Is A Chord? An Interval? A Unison? An Inverted Chord? An Extended Chord? A Slash Chord? A Sus Chord? (Watch this short video!)
One note played alone is termed a “unison.” Two notes played simultaneously (or adjacent to one another) are termed an “interval.” Intervals are named by the distance between them, so there can be intervals of 2nds, 3rds, 4ths, 5th, etc. Chords are three or more notes (or pitch classes; strictly speaking, notes are the written form of pitches) played together.
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