Brain scans can be more honest and accurate than consumer surveys and focus groups but I don't think brain scans can be projected past the individual to nation-

Brain scans can be more honest and accurate than consumer surveys and focus groups but I don't think brain scans can be projected past the individual to nation-wide sales, unless the nation is made up of the same individual with the same experiences and associations... To do such a thing would probably take a cross disciplinary approach with market researchers who can fragment society into similar buyer groups for testing and perhaps musicians who can identify different techniques and sequences in the song.