"Change Key" In Music: A Key Change Example

Suppose you want to change keys from C major to G major (see the graphic below). You have to do two things:

Use the note G as the tonic note of the scale, and
Preserve the same order of intervals as when you were playing in the key of C major, namely:

So, to play in the key of G major, here’s the scale you need to use (Figure 33):

FIGURE 15: G Major Scale with Intervals Named