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Watch the Dyads online guitar lesson by Christopher Woitach from Jazz Textures

In this section we become acquainted with the useful little dyad, a two note chord. (There are those who stipulate that two notes are called an interval, not a chord, but we'll use the definition of a chord as being multiple notes played simultaneously). Any two notes struck together are a dyad. Dyads are the ultimate mobile chord, very well suited for our textural purposes. We'll define dyads in this video, and in the accompanying booklet, as ratios, 1:1 means two notes played together, 2:1 means one voice has two notes for every one in the other voice, etc. While we're defining terms, every note in a chord is called a "voice", this dates back to when most composition was for singers, but we still refer to multiple simultaneous pitches or multiple concurrent lines as voices.

Here we're harmonizing the short phrase we've been using in octaves, a classic jazz guitar sound. I demonstrate playing octaves with the thumb, the same way Wes Montgomery did. I don't use this technique for most things, but I prefer the way it sounds for octaves, smoother and fatter.