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one, two one, two
"Mic check 1, 2 1, 2" is a common phrase used to test if a microphone is working properly, ensuring sound quality and volume are adequate.
The popular usage of this phrase in hiphop culture is due to the unique pairing of the MC (rapper) and the DJ (producer)
In hiphop culture the 1's and 2's (ones and twos) are slang for the turntable.
Examples in hip-hop
A Tribe Called Quest:
The opening line of their song "Buggin' Out" is,
"Yo, microphone check one, two, what is this?".
Das EFX:
Their song title is "Mic Checka," and the phrase is used within the lyrics and visuals as well.
Sheek Louch:
His song "Mic Check" includes variations like "Mic-microphone check, one two (is this thing on?)".
Shaquille O'Neal: His 1994 song is titled "Mic Check 1-2".