The Assumptionist Choir (TAC) boasts a rich and storied history, dating back to its inception in 1968 in Mandaluyong City. Founded with a clear and noble purpose, TAC's mission has remained steadfast: to lead the congregation attending the 9 AM Mass every Sunday in the heartfelt singing of sacred hymns, thereby fulfilling the principles set forth in Musicam Sacram. This foundational document underscores the choir's commitment to fostering active participation among worshippers through the medium of sacred music during each Holy Mass celebration.

TAC's legacy is characterized by a humility that eschews personal glory in favor of elevating communal worship. They strive not to be the best choir in comparison to others, but rather the best at enabling the congregation to engage profoundly in worship. Each song selection is meticulously chosen to resonate with the hearts of those present, evoking a sense of reverence and unity in the act of collective praise.