The Grant Park Orchestra has performed for the City's Independence Eve celebration every year since the Petrillo Music Shell opened in 1978, a tradition that is changing this Friday when the 85th Army Band takes over the pre-fireworks concert. The GPO will instead perform a daytime concert on July 4 in the Pritzker Pavilion, an event the Grant Park Music Festival and Millennium Park are characterizing as a new tradition, indicating that this change is a permanent one. more ›