In Western musical notation, the staff is a set of five horizontal lines and four spaces that each represent a different musical pitch—or, in the case of a percussion staff, different percussion instruments. ... The musical staff is analogous to a mathematical graph of pitch with respect to time.

What do we notate on the staff?

Again, starting on the bottom line and moving up, the notes on the lines of the staff are E, G, B, D, and F, letters that begin the words of the sentence Every good boy does fine. For the bass clef, the spaces are A, C, E, and G, the letters that begin the sentences All cows eat grass or All cars eat gas.

Where is D on the staff?

The D major scale has 2 sharps. This major scale key is on the Circle of 5ths - D major on circle of 5ths, which means that it is a commonly used major scale key. On the bass clef, Middle C is shown with an orange ledger line above the main 5 staff lines.