Past tense of harmonize; brought into harmony or agreement, or added harmony to a musical melody.
From harmonize + -ed past tense marker. Harmonize is formed from harmony + -ize suffix. The -ed ending marks past tense in regular English verbs.
When a melody is 'harmonized,' you're essentially giving it friends—each note gets supporting notes that make it sound richer. The same melody can be harmonized in wildly different ways, which is why the same hymn tune can sound like folk music in one context and classical in another.
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