The I, IV and V chords are the there most common and arguably the most important harmonic elements in the musical universe. Built off of the first, fourth and fifth notes of any major or minor scale, these three chords form the basis for much of the music found in several genres.
https://www.guitarplayer.com/technique/the-most-common-three-chord-progression-holds-the-key-to-many-genres-tab
