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