Scales

A scale is an ordered set of notes spanning an octave, built from a fixed pattern of steps. Change the pattern and you change the sound; keep the pattern and move the starting note and you get the same sound in a different key.

The pattern is the scale

The major scale is:

tone – tone – semitone – tone – tone – tone – semitone

Start on C and that pattern lands exactly on the white keys. Start anywhere else and you need sharps or flats to preserve it — which is the entire reason key signatures exist.

The minor scales use a different pattern, and there are three common versions of it, each solving a different musical problem.

What scales are actually for

Not finger exercises. A scale defines the note pool a passage draws from, which in turn defines:

• which chords sound native to the key
• which note feels like home
• why a melody sounds bright, sad or unsettled

Related

Scales sit between intervals below them and keys above. If a scale feels arbitrary, the missing piece is usually intervals.