- Why “Fixed Do” Matters in the French Solfège TraditionIn the French Conservatory system, solfège is taught using fixed do (le do fixe). This means that do is always C, ré is always D, mi is always E — no matter the key. Why is this important? Clarity & ConsistencyChildren always know which note they are naming or singing.… Read more: Why “Fixed Do” Matters in the French Solfège Tradition