Part of the Escola Coral of the Orfeó Català, it is made up of about twenty boys and girls aged six and seven. This is a stage at which the singers begin their training in the world of music and the voice. On the basis of songs, exercises and games they seek and work to extend their voice, lightness, tune and aural recognition through listening and imitation.

This is the time when the children are educated in rhythm, beat and musical expression through singing, dancing to and acting out songs, and the singers begin to familiarise themselves with breathing and awareness of their body.

They work divided into two groups by age: Petits 1, aged six, and Petits 2, aged seven, receiving a specific musical training precisely attuned to their level of maturity. These sessions take place at the Palau de la Música Catalana and the choir has the chance to perform three times a year on stage with the rest of the Escola Coral choirs: at the Concert d’Any Nou, the end of course Concert and the Concert de Sant Esteve. Activities are also organised outside the Palau, as well as concerts, exchanges with other choirs and a working weekend. Of the last 2023-24 season, the Cuques de llum concert stands out, with works by Marc Dalmases, together with the Cor Mitjans de l'Orfeó Català and the Cor de l'SCIC.

For this 2024-25 season, the Cor Petits together with the Cor Mitjans of the Orfeó Català will present in May 2025 the cantata De qui és el bosc, with music by Josep Ollé and libretto by Marc Donat.