My theory course ‘Guitar Rut Busters: Essential Theory’ goes through major scale theory in detail and shows you how the chords (triads) in a key are defined.Audio playback is not supported in your browser. The mode contains the same notes as the G major scale (which is often termed the ‘parent major scale’ of the mode) and so it will also contain the same chords, but the order will be different: For example, the C lydian scale would be the notes: The modes at the bottom are also all diatonic scales in that they will contain the same notes as the G major scale, but the tonic is a note other than G. The seventh chord created from the fifth scale degree (which can be named the ‘dominant’) will be a dominant 7th (R-3-5-b7). Note how not all the major triads are major 7th chords. Triads contain three notes, and we add an additional third above the fifth of the triad for a seventh chord. Upper case numerals representing major triads, lower case for minor triads and the degree symbol (°) is added to the lower case numeral to denote a diminished triad (found on the 7th scale degree of the major scale). We commonly use Roman numerals to define the triad chord qualities in a key. The sound of the major scale is created by the whole-whole-half-whole-whole-whole-half sequence. The F# in the scale is to ensure there is a whole step between the 6th and 7th scale degrees (the numbers written above the notes) and a half step from the 7th back to the tonic, G. The G major scale is diatonic, in that each of the seven letters of the musical alphabet appear in order, and the scale formula (the distances from one note to the next) will contain five whole steps (two frets) and two half steps (one fret). A third spans three alphabet letters (e.g. A key is defined when we create chords from a scale by stacking thirds on top of one another. Below is a summary of the key of G major.
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