Are there clear boundaries between sacred and secular musics?

I believe there are clear boundaries between sacred and secular musics. It would be weird to play a Taylor Swift song in a church because it wouldn't be appropriate. The same thing goes for sacred music - you aren't likely to hear a hymn at a concert. Even though this doesn't only depend on the location where a song is played, it is an important distinction nevertheless. 

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Opposition of two melodic ideas is the  right answer