Chicago 18

Chicago 18 is the fifteenth studio album by the American rock band Chicago, released on September 29, 1986. This album is the first without original vocalist Peter Cetera, and the first to feature Jason Scheff on bass guitar and vocals.

With Cetera having been fired by the band in 1985 because he wanted to record a solo album, Chicago eventually hired Scheff to fill Cetera's position as vocalist and bassist. With Scheff and Bill Champlin, who had joined the band in 1981, the most prominent voices in Chicago now belonged to its two newest recruits.

Chicago again hired producer David Foster to create a followup to Chicago 17.

The band recorded an updated, high-tech remake of their classic "25 or 6 to 4" (#48). Scheff recalled when he asked Foster on the way he should sing the song, the latter responded: "Just like Cetera." The following singles, "Will You Still Love Me?" (#3) and "If She Would Have Been Faithful..." (#17) became hits. Scheff was lead vocalist on all three releases. The album also features a brief instrumental horn riff, Pankow's "Free Flight."

Despite the success of its predecessor, Chicago 18 ultimately only went gold, peaking at #35 on the Billboard Top 200 charts.