And if ever need to cut a nigga music's my knife
And if I need to bring the girls together music's my dyke

from Talib Kweli (Ft. Abby Dobson & Nelly) – Before He Walked Lyrics on Rap Genius

Meaning

Music can be anything you want it to be. It can be your hero, your Navy, your lover, your life. If you need to bring some ladies together, it’s an aphrodisiac. And if you want to cut a dude, music can be your shank, much like Eminem cut Nelly with “Detroit Grammar.” However, if you really want an example of making music your knife, look no further than “Ether.” http://www.youtube.com/watch?v=0ePQKD9iBfU

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