Why don't I know any tune to John 3:16?! It's probably the most famous verse in the Bible but that doesn't make it any easier to teach to 3 and 5 year-olds. But not even Colin Buchanan has put it to song!
Would be the first verse I'd put to music if I could 1. Write music, 2. Sing and 3. Keep it simple enough for kids.
I find teaching memory verses to children really hard. So if anyone out there knows him, please put in a request to Colin for me would you? Pretty please?