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.
While you may already have a basic understanding of this concept, a deep knowledge of the tried-and-true fretboard applications of this triumvirate will make you a more versatile player and composer.
ROCKABILLY
FIGURE 1 is a raved-up ‘round-the-clock rockabilly I-IV-V sequence in the key of A. It gives all three basic triads a makeover, adding slick-sounding 6th, 9th and 13th intervallic extensions. Voiced on the top four strings, it evokes the tight-knot arrangements of a big-band horn section.
FIGURE 1
SIXTIES ROCK
FIGURE 2 is a Beatles-esque barnburner. Dig the Fab-sounding switch from major to minor on the IV chord, and treat the slash chords Dm/F and E7/G# as extensions of the regular IV and V harmonies.
FIGURE 2
No stranger to the creative application of basic theory, Jimi Hendrix was known for his artistry at playing rhythm and lead guitar simultaneously. FIGURE 3 evokes the way he would masterfully spin a simple I-IV-V in E into a bold sonic experience. For added mojo, reach your fretting-hand thumb around the neck to grab the bass notes on the A (IV) and B5 (B) chords.
FIGURE 3
Incidentally, have you ever considered playing a diatonic I-IV-V progression completely with harmonics? It’s possible in the key of D—you can spell out all the notes of the D, G and A triads (which, incidentally, contain all seven notes of the D major scale), as demonstrated in FIGURE 4.
FIGURE 4
CLASSICAL