Ex. 1 illustrates the basic sus4 sound with an E-Esus4-E progression. Listen to the tension and release as you move between the 1-3-5 (E-G#-B) and 1-4-5 (E-A-B) constructions.
Play this progression fingerstyle, using the suggested p, i, m (thumb, index, middle) fingering. Then—in the interest of developing well-rounded chops—try attacking the strings using a hybrid picking technique.
In popular music, a sus voicing doesn’t always resolve to its parent major chord. In Ex. 2, for instance, notice how we move directly from Esus4 to Asus4. Using back-to-back sus chords extends the period of harmonic dissonance, making the ultimate Asus4-A resolution (with its 4-3 shift of D to C#) even more dramatic.
Our grand finale is Ex. 3, which features two sets of Gsus4-G grips and a progression that rises and falls along the top three strings against a droning open D. Pete Townshend used these voicings masterfully in his Tommy-era songs.