ACCorDing to thE Author, musiC notAtion is importAnt BECAusE ______.
A．it hAs A grEAt EFFECt on thE musiC-CulturE As morE AnD morE pEoplE ArE ABlE to rEAD it
B．it tEnDs to stAnDArDizE Folk songs whEn it is usED By Folk musiCiAns
C．it is thE printED vErsion oF stAnDArDizED Folk musiC
D．it EnCourAgEs pEoplE to populArizE printED vErsions oF songs