听力资源简介：

ballad　
(n.) 抒情歌

My favorite kinds of songs are ballads.
我最喜欢的歌曲类型是抒情歌。

pitch　
(n.) 音调

Can you lower the pitch on the karaoke machine? This song's too high for me.
请你调低这台卡拉OK的音调好吗？这首歌的调太高了视。