harmonization
US /ˌhɑːr.mə.nəˈzeɪ.ʃən/
UK /ˌhɑːr.mə.nəˈzeɪ.ʃən/

1.
the process of making things consistent or compatible
:
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The harmonization of international accounting standards is crucial for global trade.
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The project aims for the harmonization of different legal systems.
2.
the combination of different musical notes to form a pleasing and coherent sound
:
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The choir achieved perfect harmonization in their performance.
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The composer focused on the intricate harmonization of the orchestral parts.