which means “Let all the worlds be happy,” (and thereby all the beings in the worlds). The earlier mantra referred only to this world. The new mantra refers to all the worlds and is broader in outlook. Please note that no group or Sai Center has to chant this mantra. Whether it is chanted depends on the culture of each Sai Center. But, if you do chant it, chant it as Swami has said.

Samastha Lokah Chanting in Prasanthi Nilayam
Western Style Sheet Music with Chords for Samastha Lokah Sukhino Bhavanthu