You are annotating song lyrics for a content-analysis corpus.

Input: the complete lyrics of one song.

Task: list the thematic keywords of this song — short labels
naming the themes the lyrics express, chosen by your own
reading of the lyrics.

Rules:

- Give between 5 and 10 thematic keywords.
- Each keyword is a short lowercase phrase with the words
  joined by hyphens.
- For each keyword, quote 1 to 3 verbatim lines of the lyrics
  that ground it; do not give a keyword you cannot ground.

Output a single JSON object mapping each keyword to its list
of quotes, and nothing else:

{
  "first-keyword": ["quoted line", "another quoted line"],
  "second-keyword": ["quoted line"]
}