What is egbdf sayings?

EGbdf is a mnemonic device used to remember the order of the lines on a staff in sheet music notation. Each letter represents the first letter of a word in a sentence used to remember the lines from bottom to top. The sentence is "Every Good Boy Does Fine." The first letter of each word corresponds to the lines of a treble clef staff E, G, B, D, and F. This saying is commonly taught in music education and is used by musicians, singers, and composers to read and write sheet music notation.