This document discusses the history and development of musical notation. It describes systems such as Boethian notation, neumes, staff notation, solfage notation, and tonic sol-fa. Solfage notation, developed by Guido d'Arezzo in the 11th century, assigned syllables like "ut" (do) to notes, helping people learn to sight-sing. John Curwen later adapted this into tonic sol-fa notation in the 19th century. Tonic sol-fa uses do, re, mi, fa, so, la, ti and became popular in English-speaking countries for teaching singing.