The Catholic musical tradition goes back centuries, and is one of the two forms of Catholic music, the other being Sacred Polyphony.. Gregorian Chant is, in fact, the foundation for ALL Western music from Bach to rap and everything in between. It is a profoundly spiritual musical form as it universally associated with the Church at prayer. In that respect it differs profoundly from modern music in that it is intended not to entertain but to lift the soul to God through glorious prayer. Sacred polyphony, on the other hand, is intended to be less of a experience of communal prayer and more as a form of musical presentation intended to move the hearts of its listeners to pious sentiments.
Here are some examples:
Sung at end of day during Easter Season
Sung during Mass on Easter Sunday
Sung just before Christmas and during Christmas week
Most commonly sung during Mass