Pretty Mike shanked Two-Face Al over some gal

from Nas – Who Killed It? Lyrics on Rap Genius

Meaning

Pretty Mike represents the MICrophone and two-faced Al is the turntable — the rap game killed the DJ game as hip hop evolved from mixing into rapping.

Pretty Mike and Two-Face Al could also be a reference to
2Pac and Biggie, who arguably lead to each others' deaths,leading into the references about hip-hop becoming overly commercialized as the 2Pac vs. Biggie beef truly brought hip-hop into the mainstream.

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