Cops with a mystery, murderin' ain't shit to me
This a killing symphony, my nigga, for real

from ScHoolboy Q (Ft. Kendrick Lamar) – Evil Lyrics on Rap Genius

Meaning

There are a lot of dirty cops so don’t be surprised if they’ve murdered. http://vintagegal.tumblr.com/post/29455327700

Either way, murders ain’t shit to Q. It’s common in the area he grew up in. A “killing symphony” refers to a large number of deaths because symphonies usually have a large number of instrumentalists playing.

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