"Sound of da Police" is the second and final single from rapper KRS-One's first solo album, Return of the Boom Bap. The song begins with KRS-One whooping twice to evoke a police siren (the "sound of the police"); this recurs several times throughout the song. This song was used in the trailer for Cop Out. "Sound of da Police" was released as a CD single featuring a b-side, "Hip-Hop vs. Rap". The song is produced by Showbiz from DITC.
The lyrics refer to the police in places like Bronx, New York, which have a history of institutionalized racism, oppression and violence against the black community, and equate the modern police "officer" with a slavery-plantation's "overseer".
The b-side of "Sound of da Police" was the song "Hip Hop vs. Rap". The song contains samples of "The Bird" by Jimmy McGriff and "Ain't No Sunshine" by the Gregory James Edition. However, the song is known for KRS-One's various interpolations of songs starting halfway through the song and continuing until the end of the song. These songs, in order of appearance, are:
"Adventures of Super Rhyme (Rap)" by Jimmy Spicer (2:37 - 2:42)
Neg Dupree from Channel 4's Balls of Steel show uses the song as his entrance music, and hollers "Woop-Woop!" during the stunts although he claims that he started howling "Woop-Woop!" before the "Sound of da Police" was released to the public in 1993.
"Sound of da Police" was later sampled by Fatboy Slim in his song "Mad Flava" and Girl Talk in his song "Too Deep".
Sonic Boom Six use the 'whoop whoop, that's the sound of the police' in their song 'Piggy in the Middle'
Sampled in "S.O.D.P." and "S.O.D.B." by Born To Funk Featuring Tyree Cooper in 2007.
British comedy panel game show Never Mind the Buzzcocks occasionally features a round entitled "Whoop Whoop! Dat's Da Sound Of Da Police" in which each team will be shown a clip of a band or singer and must guess how the artist got in trouble with the police.