Probably the oldest and most used instrument of all, the voice is of particular interest to children because it is part of their body and requires no other auxiliary device.

Furthermore, children perceive the voices of their mothers while still in the womb, learning early on the nuances of this important means of communication. Voices and breathing can create a myriad of sounds that can be associated with a wide range of movements and situations in which children interact with other objects. Voices are used to create rhythms and melodies, as well as develop the association between language and music. Each of the instruments above is used to elaborate different pitch and rhythm variations. The children are guided to perceive sensations that derive from loud and soft, high and low and fast and slow. They learn to make choices and combinations, creating "compositions" of their own that are significant to them and that they can share with others. These instruments alone are sufficient in learning the basics of music. They also capable of having an effect on the entire body, stimulating corresponding body poses and movements that give more meaning to the sounds. Other instruments can be incorporated into the Ritmìa method, such as stringed instruments, different wind instruments, idiophones (such as bells, whereby the part that vibrates is the instrument itself) and the guided listening of musical performances. Silence and immobility are also fundamental to Ritmìa. If a sound that accompanies a moment stops, the body tends to stop spontaneously in a position that conserves the "echo" of the preceding movements. In other words, these moments of silence/immobility, which are extraneous to the child's nature, emphasise the sensations induced by the stimulation of sound. It is fundamental to alternate between sound/movement and silence/immobility because this favours a process by which the child identifies more with the symbol he/she is representing. It also allows children to learn to listen to their own breathing and experiment states of relaxation. Ritmìa incorporates several yoga positions into its approach to reinforce the effect created by silence and immobility.