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the choir could not harmonize
The noun forms of the verb to harmonize are harmonizer, harmonization, and the gerund, harmonizing.
There are three possible uses for the word harmonize:
1) The singer can harmonize perfectly with the music.
2) The color scheme of WikiAnswers is designed so that the blue harmonizes with the white.
3) The president wishes to harmonize the latest environmental initiative.
Verb.
thanks