Hello there. I have decided to go ahead and post the information I
have found as an answer. Please request a clarification if you require
any further help.
The quotation you are referring to is a poem by Allen C. Inman, and
appears on the Constance Demby website.
The full poem can be found here:
One of the earliest appearances of the poem I can find is in the 1992
book "Music and Miracles" by Don Campbell, according to this page
(http://www.nolibravo.com/html/ANGAR_Bible.html). Although they credit
the poem to an anonymous source.
Earlier still, if you take a look at this page which lists items that
were sold at an auction in 2001
(http://www.copakeauction.com/05-01-catalog.html), and scroll down to
number 340, you can see that it lists a painting of a poem with the
same title, and they date it in the 1920's. This is most likely the
same item that your friend has.
I did tons of searching on "Allen Inman", sometimes referred to as
"Allan", and came up with no evidence that he has done any other
writing, or even any information about the person himself. It seems
this one poem is his claim to fame.
I hope this answers your question. Thanks for using Google Answers.
"i am music" inman
"Music and Miracles" "Don Campbell"
"i am music" frame