I totally agree with Jennifer. One of the great strengths of good art is that it's universal, reaching beyond the immediate circumstances that inspired it to communicate and find response in people whom the creator will never meet. Unless the details are so specific that the original person can be identified, I don't see any reason for feeling guilty. The need to "write and sing about what's on your mind" is the very wellspring of song.

So sing it, Marion - for heaven's sake DON'T let it languish in a drawer! You never know what other bereaved parents may take comfort from it.