http://youtu.be/cBNTDlI1-nQ?t=7m10s
So there are 4 traditional themes, I can't figure out themes 1 and 4.
2 is Jesus loves me and 3 is Battle Cry of Freedom. I can hum 4 in my head, but I can't place it.
"Shall we gather at the river"
"Come thou Font of many blessings"
Ives' Piano Trio is also a great piece , I've seen people leave at the sound of a rag'd version of 'At the River', a hymn usually associated now with funerals.