Answer: At the core of Lincoln's work were the values of liberty and equality. Those values shone through in his words. More important, they were reflected in his actions. It was his closely held principles that guided him through some of the most difficult decisions that a leader could face.
At that time, record sales, radio airplay and jukebox pick where the 3 ways of media diffusion for musicians. People would normally listen to music according to one of these 3 platforms according to their lifestyle and economic position. It is also known that certain music genres could be associated to one or another platform. Therefore, limiting the quantification of reproductions to only one platform would create a bias that would produce a distortion in the information presented.
