Half Steps and Whole Steps
Most scales are based on the intervals between pitches. You can think of this like the distance you travel on the Monopoly board depending on the number that you roll. In Western music, the smallest interval is called a half step. Half steps are pitches that are adjacent to one another, like C and Db or E and F, where there is no pitch in between. On a guitar, a half step can be found easily because the neck is broken up into half steps. So, when you're shredding the green and red buttons in Guitar Hero, you're technically shredding half steps!
The other common interval is a whole step. A whole step is really just two half steps put together. An example would be C and D or A and B. Pitches that are a whole step apart tend to have the same accidentals, like C# and D# or F natural and G natural. Because whole steps are just two half steps put together, whole steps on the guitar are one fret apart. On the Guitar Hero guitar, this would be the green button to the yellow button.
Building a Scale
When we start linking whole steps and half steps together in sequence, we get different types of scales. This can become somewhat confusing or even annoying, but it's really just like learning how to play a new game. Like our racing game characters, each scale has its own set of characteristics. In this case, the characteristics are a set pattern of whole steps and half steps. Each scale follows its own pattern of whole steps and half steps. So, no matter what note you start on, you can always figure out a scale based on its pattern.
The Major Scale
The Major scale pattern is whole-whole-half-whole-whole-whole-half (W-W-H-W-W-W-H). It includes one of each letter of the musical alphabet. In Western music theory, scales tend to be measured or compared to the Major scale, so this is an important one to know.
Let's examine how this pattern works. If you start on C and go a whole step, you land on D. From D to the next whole step is E. The next distance of a half step takes us from E to F, another whole step brings us to G, another to A, another to B, and finally a half step brings us to the original pitch C. This particular scale is called the C Major scale since the pattern starts on and revolves around the pitch C. If you wanted to build the F Major scale, you just start on F and apply the same whole and half step pattern. This time, you have F moving a whole step to G, G moving a whole step to A, A going a half step to Bb, Bb to C, C to D, D to E, and E going a half step to F.
Another scale you hear frequently is the minor scale. Since the minor scale has a different tonality than the Major scale, it has a different pattern. There are actually three types of minor scales, but we'll start with the most common, the natural minor scale. The natural minor scale pattern is W-H-W-W-H-W-W. So, if you found the A natural minor scale, you would have A-B-C-D-E-F-G-A. If you found the C natural minor scale, you would have C-D-Eb-F-G-Ab-Bb-C. Here, you can see that compared to the Major scale, the natural minor has a lowered 3rd, 6th, and 7th scale degree.
The two other minor scales are similar to the natural minor, but have slight variations on the pattern. The harmonic minor scale pattern has a 1.5-step jump between the 6th and the 7th pitches. So, the harmonic minor pattern is W-H-W-W-H-1.5-H. If we start this pattern with A again, we get A-B-C-D-E-F-G#-A. When compared with the natural minor scale, you can see that only the 7th note is different. In the harmonic minor scale, the 7th scale degree is raised.
The third type of minor scale is the melodic minor scale. The melodic minor scale is an anomaly when it comes to scales because it has different ascending and descending pitches. The ascending pattern is W-H-W-W-W-W-H, where the 6th and 7th pitch are raised. The descending pattern follows the same as the natural minor scale, so overall, the scale sounds like this (please see the video at 07:52 to hear this scale).
Diatonic and Non-Diatonic Scales
Both the Major and minor scales are diatonic, in that they use each letter name once, A B C D E F G, with the repetition of the first pitch. The patterns for Major and minor scales - which are both diatonic - are virtually the same - it's just that they start in different places. However, not all scales are diatonic.
Some scales are non-diatonic in that they don't use each letter name or they use pitches which are not normally within the scale, like we saw in the harmonic minor scale with 1.5 steps. Non-diatonic scales have like a secret weapon to spice up the sound. Besides the harmonic minor scale, some common examples of non-diatonic scales are the chromatic scale and the blues scale.
The chromatic scale is actually really handy for musicians to know how to play on their instrument because it's all the pitches in alphabetical order, including sharps and flats. Its pattern is literally all half steps: A-A#-B-C-C#-D-D#-E-F-F#-G-G#. This can be somewhat confusing for beginners, since the sharp and flat notes share a pitch, like C# and Db are actually the same pitch. Just know that the chromatic scale uses sharps when ascending and flats when descending. The chromatic scale is super easy to play on the guitar since the guitar is divided into half steps - you would just play each note going ascending or each note descending, and you would have the chromatic scale.
Pentatonic Scale and Blues Scale
Some scales are quite specialized and have a unique sound. Two common examples are the pentatonic scale and the blues scale. The pentatonic scale is used in various types of cultural music from across the world and, as you may have guessed, consists of five pitches. It can either sound Major or minor, depending on the home pitch that it revolves around. The pentatonic pattern is W-W-1.5-W-1.5. When starting on C, we can see that the pattern is C-D-E-G-A and back to C. In this case, it sounds Major. Compared to the Major scale, this has scale degrees 1-2-3-5-6. If you were to start on A and cycle through the rest of the letters C, D, E, and G, it tends to sound minor, giving us the minor pentatonic.
Finally, the blues scale is just like the pentatonic scale but with an additional pitch. Its pattern is 1.5-W-H-H-1.5-W. So, starting on C, we would have C-Eb-F-Gb-G natural-Bb-C. It's this extra G - this extra note - that gives us that bluesy sound.
The building blocks of half steps and whole steps make up a variety of scale patterns. The Major, minor, chromatic, pentatonic, and blues scales are quite common in Western music and each have their own specific pattern. The scales are generally measured relative to the Major scale pattern (W-W-H-W-W-W-H). It's important to note that there are many types of scales, including some from cultures that use intervals that are smaller than a half step. Diatonic scales like the Major and minor scale use each letter note once, while non-diatonic scales don't use each letter name, or they use pitches which are not normally within the scale.
After watching this video lesson, you'll be able to:
- Describe the structure and function of scales
- Identify the pattern of many popular scales
- Differentiate between diatonic and non-diatonic scales and give examples of each
- Give two examples of specialized scales