In my opinion it would be very difficult to do so as the MP3's are not multi layered tracks that you can choose or select what so ever you want to get from the MP3's even if you apply filters to it then too it will pull out some frequencies which will make the data bad
I agree. If what the OP means by "extract" is to separate the music from the vocals to make an all instrumental track then that's almost impossible for most kinds of music.
It's still unclear to me what he's actually trying to do.
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