Sometimes he rhyme quick, sometimes he rhyme slow
And vice versa

from Madvillain (Ft. MF DOOM) – All Caps Lyrics on Rap Genius

Meaning

Alluding to Nice & Smooth’s 1991 track Sometimes I Rhyme Slow:
https://www.youtube.com/watch?v=dkl_Vq1SWKg

But this is also something DOOM has done specifically in his music.

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