To find the notes of a diminished chord, count a step-and-a-half from the root to the third, and then a step-and-a-half from the third to the fifth. The diminished triad uses a minor third, and a lowered fifth, called a “diminished fifth.” A diminished fifth is three whole-steps, or six half-steps, above the root note. The third interval in a minor chord is called a “minor third.” The fifth interval in a minor chord is the same as in a major chord, the interval of a “perfect fifth.”
Most rock and pop songs use a mixture of major and minor piano chords. “Comfortably Numb” is an example of a rock song that begins with a minor chord. Minor chords are also very common in rock and pop music. From the third, count two whole-steps (or four half steps) to find the fifth. To play a minor chord, select any root note, then count three half-steps up to the third. Minor chords, like major chords, contain three basic keyboard notes: a root note, a third, and a fifth.
