Staff (music)
This musical example shows the opening of Symphony no 5 by Beethoven.  The first three notes are on the second line (counting from the bottom).  They are Gs, because there is a treble clef at the beginning of the staff.  The fourth note is a little lower: on the bottom line, the E line (because of the flats in the key signature it is an E flat).  The next note is between the other two in pitch (an F). After the three Fs comes a D in the outside bottom space.