You say one for the treble, two for the time
Come on y'all let's rock this!
You say one for the treble, two for the time
Come on!

from Yasiin Bey – Hip Hop Lyrics on Rap Genius

Meaning

A reference to the first line of Spoonie G’s line in the 1979 song Spoonin G Rap… and later used in Limp Bizkit’s song, “Crack Addict” (originally recorded in 1997 but released in 2003).

http://www.youtube.com/watch?v=Rv7dmq1FePM

For more on the original reference, see this informative blog post

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