Perfect Octave
Twelve Half-Steps
Major Second
Two Half-Steps
Minor Third
Three Half-Steps
Augmented Fourth (raised a half-step, sharp), Diminished Fifth (Lowered a half-step, flat)
Six Half-Steps
Perfect Fourth
Five Half-Steps
Perfect Prime
Zero Half-Steps
Minor Second
One Half-Step
Major Seventh
11 Half-Steps
Major Sixth
Nine Half-Steps
Major Third
Four Half-Steps
Perfect Fifth
Seven Half-Steps
Augmented Fifth (raised a half-step, sharp) = Minor Six (Lowered a half-step, flat)
Eight Half-Steps
Minor Seventh
Ten Half-Steps