A type of folk song that originated among Black Americans at the beginning of the 20th century,has a melancholy sound from repeated used of blue notes.是什么意思_A type of folk song that originated among Black Americans at the beginning of the 20th century,has a melancholy sound from repeated used of blue notes.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句