One, Two, Three O'clock, Four O'clock rock
Five, Six, Seven O'clock, Eight O'clock rock
Nine, Ten, Eleven O'clock, Twelve O'clock rock
We're gonna rock around the clock tonight

from Bill Haley and the Comets – Rock Around the Clock Lyrics on Rap Genius

Meaning

He states all the numbers on the clock, clockwise, going “around the clock”.

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