Answer:
1. They're important for developing the structure of a song.
2. Helping to define different sections of a song with the use of chord progressions.
3. A chord progression is a series of chords played in a sequence.
4. Progressions are used to add harmonic content to a song.
5. The I (tonic), IV (subdominant) and V (dominant) chords (primary triads) together encompass all seven tones of the tonic's major scale. These three chords are a simple means of covering many melodies without the use of passing notes. There are tens of thousands of songs written with I, IV and V chords.
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