Singing with Tension VS. Singing with Ease When a student enters my studio I make instant vocal analysis. If there is tension in the face overtones are affected and the sound is affected. Jaw tension, singing back and poor breathing affects the ability of the student to have the optimal resonance.   With the Acapelladiva method students sing with ease and clarity of sound.   See in the picture below how I transformed my students to sing with ease and clarity.