Air is not the best way to start a wave. Sound is a wave in a fluid, a geyser is not the best way to obtain a wave from one or more oscillators. A best way is to make that air a wave itself and to transmit oscillations we want becoming a sound being transmitted to our entire body in homogeneous or dishomogeneous way. We will then obtain to have all our body becoming the true oscillator and this wave produced inside to transmit to air and bodies outside. You can still sing by air, you will have a poor singing.