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NEW YORK, NEW YORK - APRIL 08:  (L-R) Inductees James Pankow, Walter Parazaider, Lee Loughnane and Robert Lamm of Chicago pose in the press room at the 31st Annual Rock And Roll Hall Of Fame Induction Ceremony at Barclays Center of Brooklyn on April 8, 2016 in New York City.  (Photo by Mike Coppola/Getty Images)
NEW YORK, NEW YORK - APRIL 08:  (L-R) Inductees James Pankow, Walter Parazaider, Lee Loughnane and Robert Lamm of Chicago pose in the press room at the 31st Annual Rock And Roll Hall Of Fame Induction Ceremony at Barclays Center of Brooklyn on April 8, 2016 in New York City.  (Photo by Mike Coppola/Getty Images)

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    Chicago reveals the meaning of '25 or 6 to 4'

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Chicago reveals the meaning of '25 or 6 to 4'

Chicago singer/keyboardist Robert Lamm tells how he wrote his mega-hit, "25 or 6 to 4."

Chicago reveals the meaning of '25 or 6 to 4'

Chicago singer/keyboardist Robert Lamm tells how he wrote his mega-hit, "25 or 6 to 4."