"Memoro de la Ŝtono" (lit. "Memory of the Stone") is a vocal section part of the Final Fantasy XI opening theme made famous by its performance during the Distant Worlds: Music from Final Fantasy and VOICES: Music from Final Fantasy concerts. It features a choral arrangement with lyrics sung in Esperanto, an artificial language invented in 1887 by L. L. Zamenhof (1859–1917), a Polish physician and philologist, intended for international use and still used by millions of speakers worldwide.