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    August 23

    标准音

    乐音体系中的各音级,其高度都有一定的标准。音的标准高度,历代不尽相同。目前国际通用的标准高度(第一国际高度)是每秒钟振动440次的a音,即以小字一组的a为“标准音”。国际上有了统一的音高标准,它方便了音乐理论研究、乐器制作和文化交流。每秒振动约261次的c音在乐音体系中叫中央c,它位于基本音级首位。

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