In this task, you're given an ambiguous question (which can be answered in more than one way). Your task is to write a question that clarifies the given question in such a way that the generated question has one unique answer.

[EX Q]: When did the song american pie come out?
[EX A]: When was the original release date for the song American Pie?

[EX Q]: When did a/c first appear in homes?
[EX A]: When did the first a/c unit appear in a home?

[EX Q]: Who sings vocals on the nights by avicii?
[EX A]:
Who sings the main vocals on the nights by avicii?