Chicago releases 25 or 6 to 4 as a single and it reaches #4 on the Billboard Hot 100. Written by Robert Lamm. James Pankow:
A 25 or 6 to 4! We’ve been one up-tempo song short for 30 years, man. You know, 25 or 6 to 4 is the encore song, every night, I don’t care where we are, when it is, that song has to be the closer of the show, because that is the rock ‘n’ roll anthem from this band. There ain’t any others.