“民歌”造句

她开始用钢琴演奏那首民歌.
She struck up a folk melody on the piano.

应观众再唱一曲的要求, 他清唱了一首民歌.
For an encore, he sang an unaccompanied folk song.

她在哼一首我以前从未听过的民歌.
She is humming a folk song that I never heard before.