The document discusses various musical notation symbols used to organize notes on the staff. It defines the staff as the set of five lines and four spaces where notes are written. Measures are the sections of music between bar lines, which divide the staff. A double bar line, consisting of two vertical lines, indicates the end of a musical piece or song.

1. Staff, Measure, Bar
Line, and Double Bar
Line

2. In music, notes are organized in a staff to
create a combination of sounds pleasurable to
listen to.

3. Staff
The staff is where the notes of music are
written. It consists of five lines and four
spaces.

5. Bar Line
The bar line is the vertical line that
divides the staff into measures.

7. Measure
The measure is the distance between
two bar lines.

9. Double Bar Line
The double bar line consists of two
vertical lines that appear at the end of the
staff. It indicates the end of the musical piece
or song.