Working together in a pleasing or effective way, or singing or playing musical parts that blend together.
From 'harmony,' which comes from Greek 'harmonia' (joint, accord, fitting together), from 'harmos' (joint). Adding '-ize' creates a verb, and '-ing' makes the present participle.
In music, harmonizing isn't about being identical—it's about complementary differences that blend into something greater. That's why the metaphorical use works so well: teams 'harmonize' when individuals stay themselves but work toward the same goal.
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