Hello Brian Brocklehurst and all Orff teachers, for whom pentatonic songs are bread. "Shortnin' Bread," despite its ethnic connections is often the first song kids can sing and pick up immediately. The AA' pattern is appealing, they try at home on the black keys and come roaring in playing it the next day!
Many playground chants (ball bouncers, jump rope) as well as Swing Low Sweet Chariot fit the scale, as do spontaneous improvisations.
VERY best of the lot?
Bright Morning Stars are Shining
How Can I Keep From SInging?