曲子在英语中通常称作 "song" 或 "tune"。它的来源可能源自古代的拉丁语，在拉丁语中，"canticum" 指的是一首唱歌，而 "cantus" 则指的是唱歌的声音。

例句：

I love listening to songs. (我喜欢听歌。)

She hummed a tune as she worked. (她工作时哼着曲子。)

He wrote a beautiful song for his girlfriend. (他为他的女友写了一首优美的曲子。)

I can't get that tune out of my head. (我忘不了那首曲子。)