Question: abc or do re mi?
Answer: The official name for this is “solfege”. If you are in the key of C Major, “do” would be C, “re” would be D, and “mi” would be E, etc. Or if you are in the key of A Major, “do” is A, “re” is B, “mi” is C#. ... The United States uses only A, B, C, (etc) and many European countries use “do, re, mi etc”.