赵：“爱情”是很多音乐门类的主题，尤其是流行音乐。
Zhao: "Love" is a theme for many kinds of music, especially for pop music.
方大为：乡村音乐实际上是一种非常广泛的音乐门类，它包含各种各样的元素。
David J. Firestein: Country music is actually a very broad category of music, and includes a lot of different kinds of things.
艺文艺术领域或门类的一支，如音乐，芭蕾或文学。
A field or category of art, such as music, ballet, or literature.
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