From American Songwriter
In June of 1970, Chicago scored their first Top 5 single, with “25 Or 6 To 4”. The song, written by the band’s own Robert Lamm, is part of Chicago’s eponymous debut album.
Surprisingly, lead singer Peter Cetera had to sing this song with his jaw wired shut after an unfortunate altercation at a baseball game. Cetera was reportedly at a game where his Chicago Cubs beat the Los Angeles Dodgers at Dodger Stadium. He was celebrating the Cubs’ win when he got into a fight with four Marines, who apparently didn’t like the way he was celebrating. Cetera was injured in the argument, with his jaw being broken in three places.
The result was that his jaw was wired shut for three months, during which time, Chicago wanted to record “25 Or 6 To 4”.“He had to learn to sing differently,” producer James Guercio tells Mix Online. “I told him, ‘I can’t wait, we’re gonna do this.’” Not only did Cetera nail his performance of “25 Or 6 To 4”, but it began a new style of singing for him, with his teeth clenched.