What radio stations play nothing but heavy metal and rock music?

My parents dont approve of tha kind of music that i LOVEEE to listen to so i cant buy any CDs of the groups i like so the only way i can listen to the kind of music i like is to listen to it on the radio. So what radio stations play NOTHING but heavy metal and rock music? And also names of bands that are awesome and play the best heavy metal and rock will be appreciated also. Thanks!!
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radio stations