"Hail to the Orange" is the alma mater of the University of Illinois at Urbana-Champaign.
The song, along with "March of the Illini" and "Pride of the Illini", is part of the "Three-In-One" performed by the Marching Illini at the end of every halftime performance.
"Hail to the Orange" is also performed during every chime concert on the 15-bell chime in Altgeld Hall.
References
Hail to the Orange Wikipedia(Text) CC BY-SA