vocalise
/ˈvəʊkəlaɪz/noun
1- Music a singing exercise using individual syllables or vowel sounds to develop flexibility and control of pitch and tone【乐】练声。
1.1
- a vocal passage consisting of a melody without words练声曲：
the second movement is in the spirit of a vocalise.
第二乐章实质是一种练声曲。