Module: Theory & Ear Training
Learn the major and pentatonic scales as tools for melody and improvisation.
Lesson objectives
Two scales cover most of what you'll ever need: the major scale and the pentatonic scale. Learn these well and you have the tools for melody, improvisation, and understanding why chord progressions work.
The major scale is the reference point for Western music theory. Every interval name, every chord formula, every key signature - all of it measures from the major scale. Its sound is familiar because it's been used in Western music for centuries.
Pattern: W-W-H-W-W-W-H (W = whole step, H = half step)
On the C string of your ukulele, starting at the 3rd fret (E), you can play a C major scale entirely on one string: frets 3, 5, 7, 8, 10, 12, 14, 15. The gaps (2, 2, 1, 2, 2, 2, 1) show the whole/half-step structure directly.
In practice, major scales are usually played across multiple strings to keep your hand in one position rather than running up a single string.
The pentatonic scale is a five-note subset of the major scale. It removes the 4th and 7th degrees - the two notes that create the most tension against the root. What's left is a set of notes that all sound relatively consonant against any chord in the key.
C major pentatonic: C, D, E, G, A (no F, no B).
The pentatonic scale is forgiving. Almost any note in it works over almost any chord in the key. That's why it's the first scale taught for improvisation - you can play it and not land on an obvious "wrong" note.
The minor pentatonic is the same five notes as the major pentatonic, but starting from the 6th degree. In C major, the 6th degree is A. So A minor pentatonic uses the same notes as C major pentatonic: A, C, D, E, G - different starting point, darker character.
Minor pentatonic sounds darker and works well over minor chord progressions. It's the backbone of blues and rock improvisation.
Start simple: take a I-IV-V chord progression in C (C, F, G) and loop it. Over that loop, pick notes from the C major pentatonic at random. Some combinations will sound better than others. Notice which notes feel stable when you land on them during each chord. You're starting to hear how melody and harmony interact.
Play the C major scale up and down on your ukulele three times slowly, saying the note names: C, D, E, F, G, A, B, C. Then remove the F and B and play the pentatonic version: C, D, E, G, A, C. Compare the two sounds. The pentatonic should feel slightly more open and even-tempered. Practice both from memory, aiming for clean, even notes at a comfortable speed before increasing tempo.
Next up: Introduction to Modes - how shifting the starting point of the major scale creates different modal colors.
