who sang lead vocals on 25 or 6 to 4
25 or 6 to 4 An updated version of "25 or 6 to 4" was recorded for the 1986 album Chicago 18 with James Pankow listed as co-writer.[5] With the new band member Jason Scheff on lead vocals, the single reached No. 48 on the U.S. chart.[6] This version was also used as the B-side for the band's next single in 1986, "Will You Still Love Me?".[7]