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The hit song "Knock You Down" by Keri Hilson is a vibrant collaboration featuring the remarkable talents of Kanye West and Ne-Yo. Kanye West showcases his signature vocal delivery and production prowess, adding depth to the track. Ne-Yo, known for his soulful voice and songwriting skills, complements Hilson's vocals, creating a harmonious blend of voices and melodies that captivate listeners.