Harmonization happens when musical notes combine into one chord often in thirds or sixths, and then into chord progressions1. ... In rock or pop music, a backup singer will harmonize with the lead singer by adjusting the pitch of her note based on the lead singer's pitch so that they are in tune.
What does it mean when you harmonize?
: to play or sing different musical notes that sound pleasing together : to play or sing in harmony. : to be combined or go together in a pleasing way : to be in harmony. : to cause (two or more things) to be combined or to go together in a pleasing or effective way.
Why do voices harmonize?
Usually the melody line is made up of notes that are in the chords (which is why the melody and chords sound good together). The "harmony" line is a carefully crafted line which uses some of the other notes in the chords. When you hear both, they work together to create the chord progression.