do = c, re= d, mi = e, fa= f, sol = g, la = a, ti = b

The inventor of solmization was Guido of Arezzo (995-1050), who used the six syllables of ut re mi fa sol la located on three degrees of the diatonic (C major) scale (e.g. c d e f g a).  Guido derived these from an 8th century hymn to St. John the Baptist, the melody of which has six lines starting successively on c, d, e, f, g, and a: Ut queant laxis, Re-sonare fibris, Mi-ra gestorum, fa-muli tuorum, so-lve polluti, la-bitt reatum ("So that your servents may sing at the top of their voices the wonders of Your acts, and absolve the fault from their stained lips").  In essence, Guido  created a system of designating the degrees of the scale by syllables rather than by letters.

Guido theory of the hexachord, where there a group of six consecutive tones with a half tone in the middle is based on the diatonic scale, the first, outlined before, of 'c', or the hexachordum naturale.

After his contributions, the Guidonian hand was developed where the topology of the hand could be used as an aid of memorizing the scale, from tones of G (at the thumb) to e" (at the tip of the middle finger).  c d e f g a b would be derived by the bottom of the pointer, across the ridges at the top of the palm up through the pinkie.

So, when Dame Julie Andrews says she's 'making it easier', what she means to say is that is was manufactured over 800 years prior by a monk who grew tired of the monotony of Gregorian chant.