8 note songs

Songs you can play with only eight notes (one octave, C to C)

Camptown Races
Do-Re-Mi (thanks, Jean!)
I'm a Little Teapot
Joy To The World (thanks, Ted!)
London Bridge
Oh, Susannah
Old Man River
Old McDonald
On Top of Old Smoky (thanks, Jean!)
Mary Had a Little Lamb
Row, Row, Row Your Boat (thanks, Mom!)
Ram Sam Sam
Star Wars Theme (thanks, Ted!)
Three Blind Mice
Twinkle, Twinkle Little Star/Alphabet Song/Baa, Baa Black Sheep
Wheels on the Bus
When the Saints Go Marching In
 

Songs you can almost play with 8 notes

Alouette
Eency Weency Spider
Frere Jacques
This Land is Your Land