Filtering by IP address will work, however, it will be a chore keeping up with it. You might want to consider one of the filtering products. They do the chore of finding the addresses of popular sites and can even update their filter automatically. In addition, you'll be able to set filters for other potential bandwidth abusers and other hazards. I'm not a big fan of any of the programs in particular, but you can locate dozens by simply searching on 'blocking streaming audio.'
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