Historian Ambeth Ocampo observed in 2006 that the Spanish lyrics, which were not intended to be sung when composed, do not flow with the music very well compared to later English and Tagalog versions which are smoother. Also, some of the original meanings in "Filipinas" have been lost in translation; for example, "Hija del sol de oriente" (literally, "Daughter of the Orient (Eastern) Sun") in the original Spanish version became "Child of the sun returning" in the Philippine Hymn and "Perlas ng Silanganan" ("Pearl of the Orient") in the present (official) Tagalog version. In 2011, Senator Bong Revilla introduced a bill which, among other things, would have removed the requirement that the anthem be sung "in its original Tagalog lyrics and march tempo", but this was not promulgated into law.