These five lines are called the staff or stave. Music notes are written in the spaces and on the lines of the staff.
This is a musical note called a quarter note.
This symbol is called a treble clef.
A staff with a treble clef written on it is called a treble staff.
Middle and high notes of the harmonica are played on the treble staff.
All of the harmonica music in this book will be written on the treble staff.