Harmonic Singing & Harmonic Listening
Harmonic Singing is my term for singing chord arpeggios.
Harmonic Listening is better known as "taking harmonic dictation."
To increase your ability to identify harmonies--or chords--
learn to sing chord arpeggios. Sing them in tune, and sing them fast.
The goal is to hear the individual tones of a chord all at once.
The links below will help you sing and identify harmonies in real musical excerpts.