High Quality Content by WIKIPEDIA articles! "Knock You Down" is a song by American singer-songwriter Keri Hilson, taken from her debut studio album, In a Perfect World... (2009). The song features guest vocals from American singer-songwriter Ne-Yo and American rapper Kanye West. The song was written by Hilson, West, and Ne-Yo along with Kevin Cossom and Marcella Araica. Danja, who produced the track, also receives writing credits. The song is an electrohop and R B number, which includes elements of pop music. The song was released first released to rhythmic and urban airplay in the United States as the album`s fourth single in the US, and it would later serve as the third worldwide single. The lyrics of the song pertain to how love "knocks you down." Part of the song refers to Michael Jackson; coincidentally it was released at the time surrounding the death of the late singer. The song received generally positive to mixed reviews, with critics divided as to whether Ne-Yo and West overwhelmed Hilson`s appearance. However, reviewers also complimented that the song was radio-friendly. It was nominated for multiple awards, including Best Rap/Sung Collaboration at the 52nd Grammy Awards.