Mary Had a Little Lamb _(C major scale)_
Happy Birthday to You _(F major scale)_
Twinkle, Twinkle, Little Star _(C major scale)_
Jingle Bells _(G major scale)_
Old MacDonald Had a Farm _(F major scale)_
Amazing Grace _(G major scale)_
Silent Night _(C major scale)_
The Star-Spangled Banner _(F major scale)_
Over the Rainbow _(C major scale)_
When the Saints Go Marching In _(Bb major scale)_
Many folk songs, hymns, and traditional melodies use diatonic scales because they produce a simple and familiar sound.