"Therefore my question is: How does Doug know what those "Final Strike" songs (or any
of the more lethal "Never Use It" songs) do? He should have died or caused a major
disaster the first time he used them, not knowing their effect."
Well Doug has access to the lyrics of all the songs that he takes a look at. If i were Doug (scary thought) I would first look at the lyrics of a song before even trying to listen to it. I'm sure that if the lyrics might hint at very bad things happening to him and the area around him he won't use it. I think this was mentioned in one of the chapters when he was discussing backfires with Lisa if I recall correctly.
of the more lethal "Never Use It" songs) do? He should have died or caused a major
disaster the first time he used them, not knowing their effect."
Well Doug has access to the lyrics of all the songs that he takes a look at. If i were Doug (scary thought) I would first look at the lyrics of a song before even trying to listen to it. I'm sure that if the lyrics might hint at very bad things happening to him and the area around him he won't use it. I think this was mentioned in one of the chapters when he was discussing backfires with Lisa if I recall correctly.