This a letter to whoever, I'm just tryna set you free
Remember love, if you can't, remember me

from Mac Miller – 1 Threw 8 Lyrics on Rap Genius

Meaning

Another reference to a note of some kind left to whoever. He could also be talking about his lyrics in his songs … listen to the lyrics and you will find love and freedom.
So if you can’t remember love, remember Mac.

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