Chris Hyde, Getty Images Although Soundgarden are in the midst of their current North America tour run, the recently reunited rockers just added a very special appearance to their itinerary. Frontman Chris Cornell has signed on to perform at the Commander-in-Chief’s Ball, helping President Obama and Vice President Biden honor U.S. armed forces, while all of Soundgarden will be providing entertainment at the Inaugural Ball on the same day. Scheduled for Monday, Jan. 21, at the Washington Convention Center, the Commander-in-Chief’s Ball will recognize Medal of Honor recipients and Wounded Warriors with a guest list that includes both active duty and reserve military. In addition to Chris Cornell, the entertainment portion of the evening includes artists and celebs like Alicia Keys, Brad Paisley, Jamie Foxx and Jennifer Hudson. Things get turned up a few notches for the Inaugural Ball, which will feature several artists,  including Soundgarden, performing on multiple stages. An all-star cast of stars will join Soundgarden in the celebration, among them Stevie Wonder, Usher, Katy Perry and Smokey Robinson. Many of the artists performing have played a role in helping President Barack Obama get re-elected, including Cornell. Back in September, he joined a rally for President Barack Obama in Des Moines, Iowa, and performed a moving acoustic set. The Inaugural Ball serves to celebrate and unify Americans across the nation from community leaders to grassroots volunteers and elected officials. In addition, U.S. military around the world will be invited to join in the celebration through a live broadcast and everyone is invited to tune in here for a live stream. [button href=”http://loudwire.com/soundgarden-announce-2013-north-american-tour-unveil-been-away-too-long-video/” title=”Soundgarden 2013 North American Tour Dates” align=”center”]