Key signatures are really important for setting the mood of a song. They help create the feeling you get from the music by using different scales. Here’s how key signatures can change how a song feels:

1. Major vs. Minor:

   • Songs in major keys, like C Major or G Major, usually make us feel happy or joyful. About 78% of pop songs use major keys.
   • On the other hand, minor keys, like A Minor or E Minor, often make us feel sad or thoughtful. About 23% of songs use minor keys, showing how well they can express deeper feelings.

2. Common Key Signatures and Their Moods:

   • C Major: Makes you feel uplifted and bright.
   • A Minor: Feels somber and thoughtful.
   • D Major: Sounds triumphant and full of energy.
   • E Minor: Gives a melancholic and reflective feeling.

3. Transitions and Modulation:

   • Switching between major and minor keys in a song can create surprising changes in emotions. This happens in over 15% of modern songs, showing how it keeps listeners interested.

By knowing how key signatures relate to feelings, songwriters can really play with emotions and make their music more powerful.