A massive crowd has gathered in central Bangkok to sing a special version of Thailand's royal anthem in honor of King Bhumibol Adulyadej, who died this month.

A large field in front of the ornate Grand Palace complex was packed Saturday with black-clad mourners, as were all the approach roads. Police eventually closed the roads to traffic.

The king's body is lying in one of the palaces in the complex while royal funeral ceremonies are going on. No date has been set for cremation, which will likely take place after a year.

Led by the Siam Philharmonic Orchestra and a 100-strong choir, the crowd sang an emotional version of "San Sern Pra Baramee," or "Salute to the Monarch."

Bhumibol died Oct. 13 after reigning for 70 years.