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のうたです

is a song by/of

→ の
phrase Rare #22,786
is a song by/of の links the song to a person, subject, or owner; the exact relationship depends on context.
JA: これは姉のうたです。
EN: This is my older sister’s song.

「ぼくのは狐のうたです。」

Mine is a song about a fox.

「わたしのは清作のうたです。」

Mine is a song by Seisaku.

ぼくのは猫のうたです。

Mine is a song about cats.