Build the scale in two four-note pieces

Four notes, three gaps, then a bridge

C D E F and G A B C each use W W H. A whole step from F to G connects the two groups.

Carry the upper piece into the next key

A tetrachord is a four-note span. The major-scale tetrachord here uses W W H. Keep G A B C as the lower piece of G major, then build D E F# G above it.

The reused piece stays intact. Raising F to F# makes the new upper piece match the recipe. This is a construction reason behind the move from C major to G major.

Complete the next major-scale pair

Keep G A B C. Complete D E F# in the second piece using one letter per degree and W W H in each four-note piece.

Hear each piece return to its whole scale

First hear the two pieces separately, then identify their place in the scale map.

Takeaways

• Two W W H pieces plus a whole-step bridge reconstruct major.