My husband and I have great variety in our music choices and our daughter has had some sort of MP3 player since she was 4 (she is 17 now). We have never really censored what we turned up or simply had on in the background in the car with her, ever. She is a great music lover, can debate music lyrics, knows ALOT of music trivia (old and new, songs, artists and dates, etc...her dad is the same way actually), and is terribly envious of the music kids at her Arts school who can sing! She, sadly like her father and I, can not carry a tune in any sort of bucket or other vessel! LOL.
But she does not appreciate alot of rap...unless the lyrics are meaningful, comedic, or otherwise silly and entertaining. Degrading, murdering, hurtful, etc does not fall into that. Shes a good kid, with a good head on her shoulders and we feel good about exposing her to all of it and letting her decide. She is not a "sheeple" (sheep people)...what she and we define as someone who follows along like a sheep in a herd...just because others say a type is music is "cool" or "must" be listened to...that has never held true for her, or for us.
Now I am going to go search my ZUNE library and make sure I have some Heavy D to listen to! RIP