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 鳴禽鳴囀的最大特點之一便是其單次鳴唱時間長,鳴唱所包含的音節數量和音節種類繁多,因而由這些音節所組成的句型結構也是復雜多樣富于變化,且由于nxiits嚴格的側別控制(每一側核團只支配同側鳴肌) ,使其具有更強的控聲能力,其鳴聲音調變化幅度大,頻率高,品質因數大,音色好,因而其鳴聲也悅耳動聽。