Said, I rather bust off them keys
It’s easier to do wrong than to do what’s right so He’d rather sell drugs(Keys) than make an honest living.
“Connect said it’s something up his sleeve” means that his gang-banging friends have a plan to do something illegal. Connect as in, people who can hook you up so you can do something shady like kill people or rob or sell drugs.
Instead of listening to his friends he decides to bust off them keys, which here means making music. Keys being musical notes.
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