Question: When was the American rock band formed after leaving which Peter Cetera published his third album One More Story (1988)?

Context paragraphs:
Solitude/Solitaire: Solitude/Solitaire is the second solo album by former Chicago bassist and vocalist Peter Cetera, and his first album after leaving the band in 1985.  The album was released in June 1986.  It includes the hits "Glory of Love" and "The Next Time I Fall" (with Amy Grant).  Both reached the No. 1 position on the "Billboard" Hot 100 chart.  Produced by Michael Omartian<ref name="Solitude/SolitaireCD"> </ref> (who later co-produced Cetera's 2001 album, "Another Perfect World"), the album was Cetera's greatest solo success, peaking at No. 23 on the "Billboard" 200 chart.  It was certified platinum by the RIAA, selling over one million copies in the U.S.

Questions 67 and 68: "Questions 67 and 68" is a 1969 song written by Robert Lamm for the rock band Chicago (then known as Chicago Transit Authority) and recorded for their debut album "Chicago Transit Authority".  It was their first single release.  Lead vocals are shared by Lamm and Peter Cetera.

Hard to Say I'm Sorry: "Hard to Say I'm Sorry" is a song by American rock group Chicago.  It was written by lead singer Peter Cetera and producer David Foster, and released on May 17, 1982 as the lead single from the album "Chicago 16".  The song hit number one for two weeks on the "Billboard" Hot 100 chart on September 11 of that year.  It was their first top 50 hit since "No Tell Lover" in 1978, spent twelve weeks in the top 5 of the Billboard Hot 100 chart, and was nominated for a Grammy Award for Best Pop Performance by a Duo or Group with Vocal.  The single was certified Gold by the Recording Industry Association of America (RIAA) in September of the same year.

World Falling Down: World Falling Down is the fourth solo album for music artist Peter Cetera, released in June 1992, and his third album since leaving the group Chicago.

One Good Woman: "One Good Woman" is a popular song from 1988 by Peter Cetera, formerly the lead singer of the rock band Chicago.  Cetera co-wrote and co-produced the track with Patrick Leonard, and the song was included on Cetera's 1988 album "One More Story".

If You Leave Me Now: "If You Leave Me Now" is the title of a popular hit ballad by the American rock group Chicago, from their album "Chicago X".  It was written and sung by bass guitar player Peter Cetera and released as a single on July 31, 1976.  It is also the title of a compilation album released by Columbia Records (Columbia 38590) in 1983.

Chicago (band): Chicago is an American rock band formed in 1967 in Chicago, Illinois.  The self-described "rock and roll band with horns" began as a politically charged, sometimes experimental, rock band and later moved to a predominantly softer sound, generating several hit ballads.  The group had a steady stream of hits throughout the 1970s and 1980s.  Since at least 2008, "Billboard" has shown Chicago to be the "greatest of all time" American band in singles chart success, and since 2015, the "greatest of all time" American band in album chart success as well.  Chicago is one of the longest-running and most successful rock groups, and one of the world's best-selling groups of all time, having sold more than 100 million records.

One More Story: One More Story (1988) is the third solo album for music artist Peter Cetera and his second album after leaving the group Chicago.  This album includes the hit "One Good Woman," which made it to number four on the Billboard Hot 100 chart.  It also includes the single "Best of Times".  The album was co-produced by Patrick Leonard and Peter Cetera, and contains an appearance by Leonard's most famous artist at the time, Madonna (appearing on the song "Scheherazade" as 'Lulu Smith').  It also features Pink Floyd guitarist David Gilmour on "Body Language" and "You Never Listen to Me", as well as Oak Ridge Boys bass vocalist Richard Sterban and guitarist/vocalist Bonnie Raitt on "Save Me."

Greatest Hits 1982–1989: Greatest Hits 1982–1989 is the third greatest hits album, and twentieth album overall, by the American band Chicago, released by Full Moon/Reprise Records on November 21, 1989.  Covering the era that stretched from 1982's "Chicago 16" to "Chicago 19" in 1988, the set is also balanced by the appearances of both Peter Cetera and his replacement Jason Scheff.

Lowdown (Chicago song): "Lowdown" is a song written by Peter Cetera and Danny Seraphine for the rock band Chicago and recorded for their third album "Chicago III" (1971).  It was the second single released from this album, and peaked at #35 on the U.S. "Billboard" Hot 100.

Supporting paragraphs: One More Story Chicago (band)
Answer: 1967