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Yeah of course people are making songs about Bitcoin and stuff, but I mean legit big rappers like 2Chainz, Lil Wayne... mainstream rappers. How are these going to transition from dolla dolla to Bitcoin? lol.
Dolla sounds a lot more rhythmic than Bitcoin.
I mean it's their profession, they can figure something out 
Dolla can also rhyme with more words. What can Bitcoin rhyme with?