The Art and History of Sheet Music: 1897-1957,' opens Thursday, July 31 with a reception from 5 until 8 p.m., and runs ...

The group has released hits like 'How You Like That' and 'Ddu-du-ddu-du.' Now, the group is making history in the US with a 'Rolling Stone' cover story.

A Confidential cover sheet is blue, Secret is red and Top Secret is orange. Unclassified information uses a green cover sheet. Older versions of these cover sheets are shown in black and white.