I'm a slave to the rhythm
But never to a mental deafened power

from GZA (Ft. Masta Killa & RZA) – Fam (Members Only) Lyrics on Rap Genius

Meaning

Although Masta views himself as a worker in the field of hip-hop, he never works for someone who is mentally deafened. (i.e. record producers who are out solely for money who may infringe on his artistic integrity)

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