Origins of Do Re Mi Fa So La Ti Do?

Answer 1

This comes from solfege or solfeggio system which assigns each note a particular syllable. The notes 're' 'mi' 'fa' and 'la' come from syllables from words from the "Hymn of St John" written in the 8th century -'do, 'ti' and 'so' added later. Do of course refers to the C note. There is an advanced scale which also includes the sharp and flat notes (or black notes on a piano).

Answer 2

Do, Re, Mi, Fa, So, La, Ti is known as Solfège. Solfège (French), or Solfeggio (Italian), is a music education method for teaching pitch, particularly the relationship of tones inside a musical scale. Scales are the ordered succession of musical tones (pitches) in a given key from which you can build melodies and harmonies.

There are several naming systems for identifying the sequence of scale tones (scale degrees): pitch frequency, alphabetical, and numbering systems, to name a few. Solfège is another naming system for identifying scale tones and is widely used to teach ear training and sight singing.

The Solfège system assigns syllables to the notes of the scale, and this association of syllable to sound helps musicians mentally "hear" the sounds of the scale tones even before they have physically experienced the tone.

For example, in the key of C Major, the Solfège follows:

C D E F G A B C

Do Re Mi Fa So La Ti Do