Pentatonic Playing by Ear Piano Pages   William Wieland
The following tunes can be played with just the 5 black keys.
Please perform them by ear, i.e. do not use music.
Start on B flat: Hot Cross Buns (only 3 notes!)
Jolly Old Saint Nicholas (only 5 notes)
Mary Had a Little Lamb, a.k.a. Merrily We Roll Along (only 4 notes)
Peter, Peter Pumpkin Eater
Swing Low, Sweet Chariot
Start on D flat: Amazing Grace
Auld Lang Syne
Farmer in the Dell
Jesus Loves Me
Ring Around the Rosy
Start on G flat: 500 miles - Peter, Paul and Mary [Original Audio]
Old MacDonald (only 5 notes)
Start on E flat: I'd Like to Teach the World to Sing (verse)
After you have mastered one or more of these melodies in your right hand,
add chords in your left hand from the F Sharp Major Cadence Pattern.

Many more pentatonic tunes exist. I only included relatively familiar songs.
Please suggest more: