Conversation so far:
Who were Chicago's original members?
The group now known as Chicago began on February 15, 1967, at a meeting involving Walter Parazaider, Terry Kath, Danny Seraphine, James Pankow, Lee Loughnane, and Robert Lamm.
Who did Chicago perform for first?
The band Chicago performed on a regular basis at the Whisky a Go Go nightclub in West Hollywood.
When did Chicago record their first album?
The band Chicago's self-titled debut album, Chicago Transit Authority (as they were known then as), was recorded recorded January 27–30, 1969, and released April 28, 1969.
What did the album Chicago Transit Authority make it to on the charts?
The album Chicago Transit Authority made it to No. 17 on the Billboard 200 album chart.
Was the band Chicago awarded anything for the album Chicago Transit Authority?
The album Chicago Transit Authority was awarded a platinum disc.

Question: What happened next?
Self-contained rewrite: What happened next after the album Chicago Transit Authority was certified platinum by the Recording Industry Association of America (RIAA)?