Chart Position: 4

  • Written by Robert Lamm
  • Lead vocals: Peter Cetera
  • Guitar: Terry Kath
  • Keyboards: Robert Lamm
  • Backing vocals: Robert Lamm, James Pankow, Terry Kath
  • According to Robert Lamm, this is a song about writing a song
  • A new arrangement of 25 or 6 to 4 was released on the 1986 LP Chicago XVIII


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