Julie Andrews sang it as the sixth tone of the diatonic scale
... Interval name: 
Root, 2nd, 3rd, 4th, 5th, 6th, 7th, Octave ... Moir plays the same scale on piano, 
and then Worth sings it, Julie Andrews-style, as Do-Re-Mi-Fa-Sol-La-Ti-Do ... 
Worth then adds that the major scale is an example of a diatonic scale.