Salt all in my wounds
Hear my tears all in my tunes

from Kendrick Lamar (Ft. Gunplay) – Cartoon & Cereal Lyrics on Rap Genius

Meaning

He’s been through tough times in his life and he converts that to his music. He wants you to feel his struggle through his bars

Tears are also salty, so his ‘tunes’ are like salt in a mental wound: viciously painful.

Also, of course, tunes and ‘toons are homophones. This is important because Gunplay’s tunes are like a cartoonish depiction of his life.

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