AN ORDINANCE AMENDING ORDINANCE NO. 7856, REQUIRING THE SINGING OF THE CITY'S HYMN (AWIT NG MAYNILA) IN ALL FLAG CEREMONIES OF SCHOOLS, OFFICES AND OTHER INSTITUTIONS/OFFICIAL PROGRAMS, AND IN THE OPENING OF ANY AND ALL OFFICIAL GATHERINGS IN THE CITY OF MANILA, PRESCRIBING PENALTIES FOR VIOLATION THEREOF AND FOR OTHER PURPOSES.