don't talk nonsense if you don't understand. Correct: sound name CDEFGAB, roll call 1234567. Never heard of anyone singing 3456712. The highest sound of the sea in Tom Chang is b2, and everyone should love A Xin when he dies. The highest sound is c3 (that is, high C), which is higher than b2. In the order of CDEFGAB, that is to say, e4 is higher than d4. It would be nice for a male voice to reach c3, which is an octave higher than c3. A3 must be higher than b2, and it's seven degrees higher. If you don't understand, you can continue to ask