The modulation of sound properties over a wide range of time scales is one of the most obvious characters of oscine passerine ' s vocal , whose song contains many different kinds of syllables that consist of many more multiple song phrases . in oscine passerine , ipsilateral projections of ra to nxiits innervates the ipsilateral syringeal muscles exactly , and thus they have strong ability of vocal control with variable tones , high frequency and higher lever of quality . as a result , the songs sound well 鸣禽鸣啭的最大特点之一便是其单次鸣唱时间长，鸣唱所包含的音节数量和音节种类繁多，因而由这些音节所组成的句型结构也是复杂多样富于变化，且由于nxiits严格的侧别控制(每一侧核团只支配同侧鸣肌) ，使其具有更强的控声能力，其鸣声音调变化幅度大，频率高，品质因数大，音色好，因而其鸣声也悦耳动听。
