#3. "Little Robin Redbreast"
See Iona & Peter Opie, The Oxford Dictionary of Nursery Rhymes, new edition (Oxford, 1997, pp. 441-443).
#6. "Du, Du, Liegst Mir im Herzen"
See James J. Fuld, The Book of World-Famous Music, 4th ed. (Dover, 1995, p. 207)
~Masato