The I – V – vi – IV chord progression is one of the most popular and widely used chord progressions in contemporary music across various genres, including pop, rock, and folk. This progression is known for its emotional and uplifting sound, making it a favorite among songwriters.

Examples of Songs Using the I – V – vi – IV Progression:
“With or Without You” by U2 (D – A – Bm – G in D Major)
“Let It Be” by The Beatles (C – G – Am – F in C Major)
“No Woman, No Cry” by Bob Marley (C – G – Am – F in C Major)
“Perfect” by Ed Sheeran (G – D – Em – C in G Major)
“Someone Like You” by Adele (A – E – F#m – D in A Major)
“Demons” by Imagine Dragons (E – B – C#m – A in E Major)
“I’m Yours” by Jason Mraz (B – F# – G#m – E in B Major)

Why This Progression is Popular:
Emotional Impact: The shift from the major chords (I and V) to the minor chord (vi) and back to another major chord (IV) creates a sense of movement and emotion that resonates well with listeners.
Versatility: This progression fits well in a variety of genres, including pop, rock, folk, R&B, and country.
Simplicity: It’s easy to play on guitar and piano, making it a go-to for both beginners and experienced songwriters.
The I – V – vi – IV chord progression’s timeless appeal lies in its balance of familiarity and emotional depth, making it a staple in songwriting for decades.

Here are some common examples of the I – V – vi – IV chord progressions in different keys:

1. Key of C Major:
   Chords: C – G – Am – F
   Notes: This is perhaps the most straightforward and frequently used set of chords in pop music.
2. Key of G Major:
   Chords: G – D – Em – C
   Notes: This set is a staple in both pop and folk genres, providing a bright and warm sound.
3. Key of D Major:
   Chords: D – A – Bm – G
   Notes: Used frequently in rock and country music, this progression gives a strong and stable feel.
4. Key of A Major:
   Chords: A – E – F#m – D
   Notes: This set of chords is common in both acoustic and electric guitar-based music, offering a slightly more edgy sound.
5. Key of E Major:
   Chords: E – B – C#m – A
   Notes: A popular progression in rock and pop, providing a driving and energetic feel.
6. Key of F Major:
   Chords: F – C – Dm – Bb
   Notes: This progression is used for a softer, more mellow sound, often found in ballads.
7. Key of B♭ Major:
   Chords: B♭ – F – Gm – E♭
   Notes: Offers a rich, full sound, often used in soulful or emotional songs.
8. Key of A♭ Major:
   Chords: A♭ – E♭ – Fm – D♭
   Notes: Common in more sophisticated pop songs and some R&B music.