These five lines are called the staff or stave.
This symbol is called a treble clef. There is a treble clef at the beginning of every line of most vocal sheet music.
A staff with a treble clef written on it is called a treble staff.
There are only seven letters used for notes in music:
These notes are known as the musical alphabet.
Music notes are written in the spaces and on the lines of the treble staff.
This music note is called a quarter note.
A quarter note lasts for one beat.