You bring up a good point, Shula. When my kids took piano lessons, every song in their books was attributed to the author of the book - and I knew a number of those songs were written by others.
And yes, I erred for the sake of brevity in saying that you thought the song was from the saint. If you had thought the attribution to be correct, you wouldn't have asked me about it.
Mea culpa. Mea culpa. Mea maxima culpa.
-A Contrite Joe Offer-