Music theory explained on a virtual piano

intervals

intervaltechnical name
1 semitoneminor second
2 semitonesmajor second
3 semitonesminor third
4 semitonesmajor third
5 semitonesperfect fourth
6 semitonestritone
7 semitonesperfect fifth
8 semitonesminor sixth
9 semitonesmajor sixth
10 semitonesminor seventh
11 semitonesmajor seventh
12 semitonesoctave

basic chords

scales

seventh chords

other chords

The names of piano keys

Note that the interval between two adjacent sounds in this table is one semitone horizontally and one octave vertically.

with frequencies:

Select the voice for the gadgets above: