From the Mouseplanet weekly update:
A new flag retreat ceremony
One of the frequently overlooked ceremonies is the flag retreat ceremony in the Town Square end of Main Street shortly before dusk everyday. A new ceremony has been put in place that may make it a bit more of a destination event.
The entire thing is now about 15 minutes long, and begins with the Disneyland Band marching down Main Street, playing a patriotic arrangement. Upon arriving at Town Square, they surround the flag pole and are then joined by the Dapper Dans, who then sing "Oh Beautiful," accompanied by the band.
Note the Disneyland band and the Dapper Dans.
After this, the official voice of Disneyland thanks military members, veterans, and their families, and invites them to join in at the flag pole when their service anthem is played. Once all the services have been represented, Disneyland security then retires the colors, to the strains of "Retreat." The ceremony concludes with a performance of the national anthem, sung by the Dapper Dans.