Musical scales are the notes of music arranged in a series of steps based on frequency and pitch. These scales are derived from one large scale we call the chromatic scale, which includes every note in our musical system. See the chromatic scale below. All of the notes have an enharmonic equivalents except for E and B. Enharmonic notes are the black keys on the piano and can have two different names. C#, for instance, is the same note as Db. The basic rule for naming the note is to call it a sharp when ascending and call it a flat when descending. The natural notes on the guitar are a whole step apart, meaning there will be a fret between them, except when you move from E to F or from B to C. These notes are only a half step apart and have no fret between them. See the second example below.
We don’t use the entire scale when we compose or play music. The chromatic scale is broken into smaller, more manageable scales and modes. The most important of these scales are the major, minor, major and minor pentatonics, and the blues scale. The easiest way to see these scales is by the series of whole and half steps that make them up. Below is an example of the step pattern for the major scale. There are seven notes in the major scale (eight if you play the starting note twice) arranged in a series of whole and half steps. You can see the half steps between E-F and B-C. To get the major scale in any key start on the note that will be the name of the key and add the note using this step pattern. The example is in C. If you started on G instead and applied this pattern you would get a G major scale: G-A-B-C-D-E-F#-G.
The relative minor of a scale starts at the sixth note, so starting on the sixth note of the C major scale (A) and playing to the next A will give you the A minor scale. Starting on the sixth note of G (E) and playing from E to E gives you the E minor scale. This information applies to all major and minor scales. Note the step pattern the minor scale is different than the pattern for the major: W-H-W-W-H-W-W Another way to find the minor scale, then, would be to start on any note and apply this pattern to get the minor scale the corresponds with your starting note.
All scales and modes can be derived from the major and minor scales when you understand the pattern of steps between the notes. How much scale theory you want to know as a guitarist is up to you. Some guitar players play by ear and have no idea what scales they use, but a basic understanding of scales can be useful, particularly from an improvisational or compositional standpoint.
Check out this VIDEO GUITAR LESSON ON SCALES
Guitar scales and chords go hand in hand. Where scales can be thought of as melodic, chords can be thought of as harmonic. Scales are notes played one after the other and chords are notes played simultaneously. The notes that form a chord are pulled from the scale. Basic chords contain at least three notes and are called triads. See the example below for triads built on the different degrees of the C major scale.
Chords are easy to understand once you know how to build them. Major chords use the first, third, and fifth notes of a scale. If you want a G major chord you use the first, third, and fifth notes of the G major scale to get a G major chord. Minor triads have a flatted third, so a G minor chord will you the first note of the scale, the flatted third note, and the fifth note of the scale. You can apply this formula in any key to get a chord. More advanced chords are built the same way, so once you understand the principles of “spelling” chords, you can do it in any key. To make a seventh chord, for instance, you build a triad and add the seventh note of the scale. If you want a sus2 chord you would get rid of (or suspend) the third note and add the second.
Guitar scales and chords go hand in hand. Any guitarist who wants at least some music theory background will eventually have to come to terms with them.
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