The “Cestello Annunciation” is by Sandro Botticelli from 1489. You can read about it and view it here.
Information about Mary’s Song being banned in Guatemala in 1980 comes from John Ortberg who cites New Testament Scholar Scott McKnight’s research in the article, “Mary’s Carol,” published in The Christian Century, December 15, 2009. This article can be accessed here.
Barbara Brown Taylor’s wisdom about God’s time is quoted from her sermon, “Singing Ahead of Time,” published in Home By Another Way (Cambridge: Cowly Productions, 1999), pp. 18.