Scale

The major (Ionian) scale is the default “bright / stable” sound in Western music. It’s the backbone of diatonic harmony: I, ii, iii, IV, V, vi and vii° all come straight from it. Common genres: classical, pop, folk, film music, worship, EDM melodies. Usage: build singable melodies, outline major triads/7ths, and write progressions like I–V–vi–IV. For improvisation, target chord tones on strong beats and use the remaining scale tones as passing/neighbor tones.

Exercise — Parallel motion in thirds

Hands a third apart: LH on the tonic, RH on the 3rd degree of the scale. Hands stay close, keep the thirds even. Two hands. Scales in parallel thirds are a common enough thing for intermediate to advanced technical exercise. Fingers crowding each other is what makes it challenging, but it is do-able. Each hand plays the scale as it ordinarily would, just separated by a third. The fingering is on the notation, just take it slowly until you’re able to do it, then gradually increase speed. There’s really no trick to it beyond that.