The musical alphabet consists of 7 letters:
Music is written on a staff, which consists of 5 parallel lines. Notes are written on these lines and in the spaces between them.
The treble or "G" clef is placed at the beginning of each staff line. This clef indicates the position of the note G.
The other lines and spaces on the staff are named as shown in the diagram:
Extra notes can be added above or below the staff using short lines, called ledger lines.