[travisbrown]

Originally Posted by Outlaw Hans

A chord needs at least three notes. Always.

Okay, from the wiki-know-it-all...

"Theorists differ as to whether chords consist of at least three pitches. Otto Karolyi ([cite this quote], p.63), disagrees, writing that, "two or more notes sounded simultaneously are known as a chord. The vertical combination of three sounds: fundamental note, third and fifth, gives us a chord known as a triad." In contrast, Andrew Surmani (2004, p.72), writes that, "when three or more notes are sounded together, the combination is called a chord," and George T. Jones explains (1994, p.43) "two tones sounding together are usually termed an interval, while three or mores tones are called a chord." According to Monath (1984, p.37) "A chord is a combination of three or more tones sounded simultaneously for which the distances (called intervals) between the tones are based on a particular formula. (Two notes sounded simultaneously are not considered to be chords and are simply called intervals.)"

Chord (music) - Wikipedia, the free encyclopedia