Music notation: music writing system.
Clef: sign that defines the note and pitch.
C scale: notes are defined from the second line on which is placed the c scale.
Rests: different length silence periods between the notes.
Key signatures: symbol indicating that a note will be lower or higher.
Notes: represent played or song notes. The whole is twice the time length of the half and the half is twice the time length of the quarter and so on.