Thank you! The music has a very specific history - "Sleep" by Eric Whitacre. The words of the poem originally were the words of the music, but the Frost estate doesn;t allow his poetry to be set to music, so Whitacre re-wrote the lyrics with the help of a friend to what they are now.
That is an interesting history! I was curious as to what the situation is today with this poem: Was your use potentially infringing?
Well, if it was I wouldn’t be writing! I’m not the copyright police, but was interested to know more about it.
Per the American Bar Association Journal, this poem went into the public domain on Jan. 1, 2019. Which means, I think, that if Whitacre were to record today he could use the poem as a song lyric without infringing on the ownership rights of the Frost Estate.
As the creator, the OP has created a new work with Public Domain (Frost peom), copyrighted works (Sleep the recorded song), and the OP’s original imagery. New copyright clock starts.
For those interested in such minutiae, Sleep the recorded song is licensed for distribution on Youtube by direct arrangement of YT and the music publisher.
How quickly we get into complicated ownership when we make projects with multiple media sources.
Note that I am not an attorney, and nothing above should be construed as legal advice on copyright. I’m just curious about this stuff…