This that fifth wheel on the Cadillac music, right here

from Jae Millz – Living Better Than I Look Lyrics on Rap Genius

Meaning

He’s saying this music is going to sound like from the 1950’s or have 50’s feel, because 5 wheel Cadillacs came out in the 1950s

(http://www.craigboyce.com/w/2011/02/five-wheel-cadillac/)

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