Why such controversy over singing 'Vande Mataram'?

Only two days after newly elected Kamal Nath led Congress government discontinued the norm of singing Vande Mataram in the state assembly, the party took a U-turn on the same and has announced that Vande Mataram would be sung on the first working day of every month in the secretariat with the participation of police band and public.  The announcement further read that the same shall be done in state secretariat.