What is the full form of ABCD?

Related questions

1. What note is a half step lower than C?
2. What is DC music?
3. What is the lowest musical note?
4. What is the deepest note?
5. What is ABCD music?
6. Is key of C higher than D?
7. What is Segno in music?
8. What are the 12 keys in music?
9. What music notes are what letters?
10. What is the lowest note a woman can sing?

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