Solmization is a system of attributing a distinct syllable to each note in a musical scale. Various forms of solmization are in use and have been used throughout the world, but solfège is the most common convention in Europe and North America. The seven syllables normally used for this practice in English-speaking countries are: do, re, mi, fa, sol, la, and ti (with a chromatic scale of ascending di, ri, fi, si, li and descending te, le, se, me, ra). Wikipedia, Solmization
See Also
solfa syllable
solfeggio
Wikipedia, Solfege
Ramsay - The Two D's - The Rah and the Ray
Ramsay - The Minor a lateral outgrowth of the Major