“七”这个数字,不仅在日常生活中经常遇到(如每周为七天,颜色是七种,面部有七窍……等),在音乐中也是多见的。如音名有七个,唱名是七个,升,降号多至七个,古琴七根弦,三角大钢琴七英叹,花鼓七分米,键盘上一组七个白键,音乐周七天,工尺谱阶名七 The number “seven” is not only commonly encountered in daily life (such as seven days a week, seven colors, seven Qiao facial ... ...), is also common in music. Such as the sound name has seven, the name is seven, rise and fall number up to seven, seven strings of the guqin, grand piano seven sighed, hubs seven decimeters, a set of seven white keys on the keyboard, music week Seven days, work scale spectrum seven