BGMの大切さがわかる動画https://www.google.com/url?sa=t&source=web&rct=j&url=https://sp.nicovideo.jp/watch/sm12111823&ved=2ahUKEwjcvYuS-dT5AhVgyIsBHQ1lADIQwqsBegQIChAD&usg=AOvVaw2GddjZf687Ymd_HS6TNEmb