You probably won't be able to convince your parents to let you buy explicit music. You can have them listen to the music first and have them approve the songs they think are least objectionable.
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You prove to them that you are mature enough to handle the content.
There is no true way to convince your parents to buy you the game. However, you can always show them you are responsible to handle the game content. I would sit down with your parents and talk to them about their concerns with the game.
I'd say work for it and raise the $26.95 yourself. Or set a goal for something you want to do. and then your parents could agree to buy it for you if you reach the goal
Brownose
Tell them all the functions and make them sound like a benifit; "I won't need a Ipod anymore", "It will shut me up", "I won't need to use your computer for the Internet anymore!"