"Knock Knock" is a song by American R&B recording artist Monica. It was written and produced by rappers Missy Elliott and Kanye West for her fourth studio album, After the Storm (2003). Commissioned following the delay and subsequent reconstruction of Monica's third album All Eyez on Me (2002), the song is built around excerpts of the composition "It's a Terrible Thing to Waste Your Love" (1976) by American vocal group The Masqueraders. Due to the sample, Lee Hatim is also credited as a songwriter. The protagonist of "Knock Knock" warns a cheating boyfriend not to come calling.
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- http://www.monica.com/
