In 2003, aside from singing liturgical songs, the children were taught to play the Rondalla (a Filipino ensemble composed of stringed instruments such as the Banduria, Octavina, etc.) under +Mr. Jess Laxamana. A year after, the choir held a concert at the Royal Theater in Guagua, where the Rondalla group was first introduced and also performed.

In 2008, Mr. Rodolfo Palma of Bacolor, Pampanga, took over the Mirabilia Dei Rondalla composed of the old members and taught new members to regain the group. 

At present, the new recruited choir members start to learn the rondalla instruments under the supervision or Mr. Mark Salalila, a senior member of the group.