Poetry Songs

When one writes a poem
And by one
I of course mean I
Listening to a song
Ought I add a reference
To the song
To the footnotes
Or even the title?
Because when I look at this poem
From both sides now
From give and take
And something about love's illusions
I wonder
Even though I'm listening to a cover
Of the original
And not taking down every word
Perhaps I should write
A letter to Kathleen
Asking for her permission
But did Joni Mitchell
Ask Judy Collins
I have no idea
And am not going to search any further
So if the use of all these names
Gets me into hot water
Consider this poem
In the public domain
With multiple authors
And not
For
Profit