Helen Winter 
7 Easy-to-Play Travel Songs for Beginners of All Ages to Play on Tongue Drum [EPUB ebook] 

You can play these songs on any tongue drum with 8 or more notes. The melodies contained within this book are simplified specifically for a one-octave diatonic tongue drum.
Each circle on the sheet corresponds to a note number that shows a distinct key on your handpan or tongue drum. Simply follow the numbers to play the melody. Please note, however,  that these circles do not indicate semitones, note duration, or rhythmic patterns.
No prior musical education or the ability to read traditional sheet music is required; you can begin playing immediately.
Contents:
A Sailor Went to Sea
Buckeye Jim
Doctor Foster
Over the River
Row Row Your Boat
Rub-a-Dub-Dub
The Wheels on the Bus