Play a note on a piano or keyboard. Hum the note that you hear.
Play another note that is four half steps to the right of the first note. Half steps are the distance between one note and the very next note. The half steps in music consist of the pattern A, A#/Bb, B, C, C#/Db, D, D#/Eb, E, F, F#/Gb, G, G#/Ab. For example if you were to play a C (a white key to the left of a set of two black keys), the note that is four half steps up is E. Hum this note.
Play another note that is seven half steps up from the first note that you played. Hum this note as well.
Play all three notes in succession. These three notes (the root, the third and the fifth, as they are termed) make up a major chord. Singing any note within the chord is singing a "vocal chord."
Sing a note within a minor chord by listening to the following notes on the piano: the root note (first note of the chord), the diminished third (three half steps to the right of the root), and the fifth (seven half steps up from the root).