To me, satanic music is music which is based upon ideas or themes which are part of satanism or inspired by satanic beliefs of the artists themselves, and these usually arent understood by most people without any knowledge of satanism. It's not simply anything which might have reference to hell or 'the devil' as so many people think. Most metal isnt satanic, and just because some bands might scream or shout does not make them satanic. Take an example of a song, Dante's Inferno by Iced Earth. This song is a journey through the nine stages of hell, which many people will immediately say is Satanic, but it isnt because it is based upon an old book by an ancient Greek author who wrote from a neutral point of view about Hell. This isnt satanic because even though it talks about hell ,there is no references to satanism or satanic beliefs, only the existence of hell which was previously written about and is believed by many people.
The chances are, if the band has any mainstream popularity, if you saw them on MTV, Radio or typically if they have any kind of mainstream fame or success like Metallica or Iron Maiden - they're NOT satanic.