Answer:
This is what I came up with trying to take it off a recording. I am not sure I have all the words correct. Would appreciate someone confirming them.
Let all my life be music
Oh let the heart of me be as a harp
Where joy and pain are blended harmony, a blended harmony
Strike; strike the harp that heals my soul
No pain or joy it bring
My only sorrow will be done, my only joy to sing
And when the great musician plays
He knows no joy or pain
Then let my heart respond and sing
Then let my heart respond and sing
Oh in the final strain, oh in the final strain
A wonder song, a living song, a ravenous song will end
And on a failing major chord
There left my pain