This is a study of Century-old Passion Tunes used in Santa Maria, Bulacan, Philippines every Holy Week. The objective of this endeavor is to identify, gather and notate the Century-old Passion Tunes through the interview of old Passion Chanters in the town of Santa Maria, in order to preserve the tradition of Passion Chanting using the Century-old Passion Tunes and hand them over to the generations to come.