Chicago will be holed up today and tomorrow at the Ocean Casino Resort in Atlantic City, New Jersey for two Christmas shows with special guests Chris Daughtry, Robin Thicke, Steve Vai, Robert Randolph and others.
The first half of the show will have them performing their first album in its entirety, 1969's Chicago Transit Authority.
The band's keyboardist and singer Robert Lamm tells us some of their guests will join them for that set, before they play with them in the second.
Among the songs on that album are "Does Anybody Really Know What Time It Is?," "Beginnings," and "Questions 67 and 68."
Both shows are being filmed for the concert TV special Decades Rock Live.