What is the significance of the four magic chords in music theory and how are they commonly used in songwriting and composition?

The four magic chords in Music Theory refer to the I, IV, V, and vi chords in a major key. These chords are significant because they are versatile and commonly used in songwriting and composition. They provide a strong foundation for creating melodies and harmonies, and are often used to create chord progressions that are pleasing to the ear. Songwriters and composers frequently use these chords to build the structure of a song and create emotional impact for the listener.