a popular song的用法和样例：
- A popular song especially of a romantic or sentimental nature.
- Lyrics and word-for-word translation of a popular song.
- A repeat of the opening statement of a popular song played by the whole group.
- Interesting Fact: A popular song was written about Wenseslao Moguel.
- She is humming a popular song.
- A solo section based on the main melody of a popular song and played by a member of the group.