Benedict XVI on Gregorian chant

Certainly as far as the liturgy is concerned, we cannot say that one song is as good as another. Generic improvisation or the introduction of musical genres which fail to respect the meaning of the liturgy should be avoided. … [W]hile respecting various styles and various sufficiently laudable traditions, we desire, as was requested by the Synod Fathers, that Gregorian chant be suitably esteemed and employed as the chant proper to the Roman liturgy. … Speaking more generally, I ask that future priests, from their time in the seminary, receive the preparation needed to understand and to celebrate Mass in Latin, and also to use Latin texts and execute Gregorian chant; nor should we forget that the faithful can be taught to recite the more common prayers in Latin, and also to sing parts of the liturgy to Gregorian chant. (Sacramentum Caritatis 42; 62)