Even if it's jazz or the quiet storm
I hook a beat up, convert it into hip-hop form

from Rakim – I Ain't No Joke Lyrics on Rap Genius

Meaning

Quiet Storm was a popular late night radio format for slow jams in the 70s and 80s. Since Rakim said this, quiet storm has actually become pretty widely sampled, making his boast less impressive. MF Doom, to give just one example, has sampled Anita Baker several times:

http://www.youtube.com/watch?v=GZAXE3-srfM http://www.youtube.com/watch?v=5Y9DYGiDL1o

And, of course, there is Mobb Deep’s “Quiet Storm”, which samples the song that gave the genre its name in the first place.

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