I thought shorty liked Mike, found out she liked Prince

from Jay Z – Venus vs. Mars Lyrics on Rap Genius

Meaning

He thought his girlfriend was a fan of Michael Jackson as revealed in a previous line but in fact she is a more of a Prince person

The conceit here is that MJ vs. Prince is like Beatles vs. Stones or perhaps even Biggie vs. Pac — your preference towards one or the other defines you as a person. Personally, I love all those fools

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