It has been customary to sing
Lokah Samastha Sukhino Bhavanthu
at the end of some devotion sessions. This sacred chant (mantra) has been recited three times after devotional singing (bhajans) in Prasanthi Nilayam for years and years. It means, "let all the people in the world be happy," (Lokah has two meanings in Sanskrit, one: people; and the other: world).
In late summer 2008, Sathya Sai Baba directed that, hence forward, we should chant
Samastha Lokah Sukhino Bhavanthu
which means “Let all the worlds be happy,” (and thereby all the beings in the worlds). The earlier sacred chant (mantra) referred only to this world. The new sacred chant (mantra) refers to all the worlds and is broader in outlook.