Give me a mic and about three nights
I turn straw into gold like Rumpelstiltskin

from Rapsody (Ft. Ab-Soul & Raheem DeVaughn) – Non-Fiction Lyrics on Rap Genius

Meaning

All he needs is one mic and a lil' extra to work a miracle. In this case, he’s turning his once unrefined skill (the straw) into something precious (the gold).

Rumpelstiltskin is a character from a fairy tale of the same name, where a young princess was given three days to turn straw into gold, but couldn’t. Rumpelstiltskin, an imp, saved her by doing this task, but in exchange for her necklace, ring and (though he didn’t get it) her first-born.

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