What do the FA do?

Answer 1

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