Key Signature: A key signature is a group of sharps or flats placed at the beginning of a staff to indicate the tonality (key) of a piece. It tells musicians which notes should be raised or lowered throughout the composition.
Major Scale: The major scale is one of the most commonly used scales in Western music. It has a happy and uplifting sound, often associated with joyful melodies.
Minor Scale: The minor scale has a more melancholic and somber sound compared to the major scale. It is often used to convey sadness or introspection in music.