With an earworm sample from Linda Scott’s “I’ve Told Every Little Star,” the lead single from Mac Miller’s mixtape, K.I.D.S., peaked at #88 on the Hot 100 after getting a boost in popularity when HBO’s 24/7 Flyers/Rangers: Road to the NHL Winter Classic revealed that the Flyers used it as a victory song. Music video director Rex Arrow provided some background information on “Knock Knock”: "When Malcolm first played me the track, we both kind of jumped to ‘It would be cool to do something that was kind of a throwback.

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