Scales
A scale is a stepwise pattern of intervals from a root note. Pick a root and pattern, see the notes light up the keyboard, hear it played.
Chords
A chord is two or more notes sounded together. The triad — root + 3rd + 5th — is the building block.
Chord ladder of the current key
Every major key produces seven diatonic triads — three major (I IV V), three minor (ii iii vi), one diminished (vii°).
Intervals
An interval is the distance between two notes. Pick two and see the name, quality, and inversion.
Note 1
Note 2
The 13 interval qualities you need. Within an octave: P1 m2 M2 m3 M3 P4 TT/A4/d5 P5 m6 M6 m7 M7 P8. P=perfect, M=major, m=minor. The tritone (TT) — augmented 4th or diminished 5th — is enharmonically the same six-semitone gap, but spelled differently depending on context.
Common chord progressions
Most pop, rock, jazz and folk songs lean on a small set of progressions. Tap to play in C major.
Roman numerals name the chord by scale degree, not key. So I-IV-V means whatever 1st, 4th and 5th chords are in the current key — you can play the same progression in any key by knowing where the numbers point.
Theory drill
Identify intervals, scales and chords from sound or notes.
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Daily challenge
Eight mixed questions. New set at midnight.
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