TrueBT – I reiterate, FFB and their mishpachos come in ALL types, from the very machmir Yeshivish, to Modern frum who keep Shabbos, KAshrus, Taharas Hamishpacha, daven every day, AND ALSO LISTEN TO SECULAR MUSIC OF EVERY TYPE. They will not discriminate against a sincere BT for listening to music that OTHER types of frum Jews find inappropriate. There are many shades of gray and we are not so elitist that we have the right to disparage someone who is an observant Jew.
Because I personally dislike it, I do not particularly endorse rap music for ANYBODY, Jew or not Jew, though certain types of it are catchy, and like anything else, can be used to elevate or lower us. We should not be negatively judgmental of someone who is in transition and enjoys this. My husband used to love to listen to Motown music (me, not so much, it’s not my thing). Both of us like the beat of Reggae music. Al taam v’rayach ein l’hitvakayach.