I fail to understand why this one has been published as a song of its own and not as a version of This Is My Song. The music of both songs is the same, composed by Jean Sibelius as part of his Finlandia . The lyrics are not altogether overlapping, but there’s not a single line in A Song of Peace that wouldn’t appear in This Is My Song. And last but not least, the titles are different, but as pointed out by Wikipedia, This Is My Song is sometimes called A Song of Peace.