Reunions of the Guess Who's classic 1960-70s lineup have occurred on a number of occasions over the years.
The first reunion was in 1979, when Bachman, Cummings, Peterson, and Wallace regrouped for a one-off appearance as the Guess Who for the CBC Television special Burton Cummings: Portage & Main, filmed on November 4, and aired on CBC on February 2, 1981.

In 1983, Bachman, Cummings, Kale, and Peterson (the "American Woman" line-up) reunited again as the Guess Who to play a series of Canadian gigs and record the Together Again live album (issued as The Best of The Guess Who - Live!
in the United States) and video at the Canadian National Exhibition bandshell on June 29, 1983.
The concert and subsequent releases were the first time Bachman had performed many of the songs written and recorded after his departure.
Four new studio recordings were also made with overdubbed audience noise.

In May 1997, with their hometown of Winnipeg facing a potentially disastrous flood, Bachman and Cummings reunited in Winnipeg for the first time in ten years in an emotional fund raiser for disaster relief organized by Tom Jackson.

At the request of the Premier of Manitoba, Cummings, Bachman, Kale and Peterson appeared together at the closing ceremonies of the Pan American Games at Winnipeg Stadium on August 8, 1999.
The reunion led Cummings, Bachman, Kale and Peterson, joined by Don McDougall, to begin practising for a reunion tour in May 2000.
In the meantime, the Dixon/Shaw/Russell/Sinnaeve lineup continued to tour, finishing already booked dates with drummer Charlie Cooley filling in for Peterson.
 The reunion band embarked on a cross-Canada and US tour beginning in 2000, although health problems precluded Kale's involvement.
Bill Wallace, Kale's replacement in 1972, was brought in once again and this lineup of the band played and toured regularly through the end of 2003.
 A live album and DVD release, Running Back Thru Canada, followed the 2000 tour.

On May 26, 2001, the band members received honorary doctorates at Brandon University in Brandon, Manitoba.
 For Cummings, this was a special privilege, since he had not graduated from high school.
That same year, the group was inducted into Canada's Walk of Fame;  The signatures of the then-current band members, Bachman, Cummings, McDougall, Peterson and Wallace, are engraved into the commemorative stone.

On July 30, 2003, the classic lineup of the Guess Who performed before an estimated audience of 450,000 at the Molson Canadian Rocks for Toronto SARS benefit concert.
 The show was the largest outdoor ticketed event in Canadian history.

As of 2004, Bachman, Cummings, McDougall and Wallace ended their association with the band, and Jim Kale and Garry Peterson, who own the trademark The Guess Who, resumed their Guess Who touring schedule of around sixty dates a year, with "Lewsh" Shaw back on keyboards, Carl Dixon on vocals and returning guitarist Bobby Bilan, who was replaced by Laurie MacKenzie in 2006.

In 2007 Bachman and Cummings began recording together; unable to use the Guess Who name, they issued the album Jukebox as "Bachman Cummings".
Reunions of the Guess Who's classic 1960-70s lineup have occurred on a number of occasions over the years. The first reunion was in 1979, when Bachman, Cummings, Peterson, and Wallace regrouped for a one-off appearance as the Guess Who for the CBC Television special Burton Cummings: Portage & Main, filmed on November 4, and aired on CBC on February 2, 1981.
In 1983, Bachman, Cummings, Kale, and Peterson (the "American Woman" line-up) reunited again as the Guess Who to play a series of Canadian gigs and record the Together Again live album (issued as The Best of The Guess Who - Live! in the United States) and video at the Canadian National Exhibition bandshell on June 29, 1983. The concert and subsequent releases were the first time Bachman had performed many of the songs written and recorded after his departure. Four new studio recordings were also made with overdubbed audience noise.
In May 1997, with their hometown of Winnipeg facing a potentially disastrous flood, Bachman and Cummings reunited in Winnipeg for the first time in ten years in an emotional fund raiser for disaster relief organized by Tom Jackson.
At the request of the Premier of Manitoba, Cummings, Bachman, Kale and Peterson appeared together at the closing ceremonies of the Pan American Games at Winnipeg Stadium on August 8, 1999. The reunion led Cummings, Bachman, Kale and Peterson, joined by Don McDougall, to begin practising for a reunion tour in May 2000. In the meantime, the Dixon/Shaw/Russell/Sinnaeve lineup continued to tour, finishing already booked dates with drummer Charlie Cooley filling in for Peterson.  The reunion band embarked on a cross-Canada and US tour beginning in 2000, although health problems precluded Kale's involvement. Bill Wallace, Kale's replacement in 1972, was brought in once again and this lineup of the band played and toured regularly through the end of 2003.  A live album and DVD release, Running Back Thru Canada, followed the 2000 tour.
On May 26, 2001, the band members received honorary doctorates at Brandon University in Brandon, Manitoba.  For Cummings, this was a special privilege, since he had not graduated from high school. That same year, the group was inducted into Canada's Walk of Fame;  The signatures of the then-current band members, Bachman, Cummings, McDougall, Peterson and Wallace, are engraved into the commemorative stone.
On July 30, 2003, the classic lineup of the Guess Who performed before an estimated audience of 450,000 at the Molson Canadian Rocks for Toronto SARS benefit concert.  The show was the largest outdoor ticketed event in Canadian history.
As of 2004, Bachman, Cummings, McDougall and Wallace ended their association with the band, and Jim Kale and Garry Peterson, who own the trademark The Guess Who, resumed their Guess Who touring schedule of around sixty dates a year, with "Lewsh" Shaw back on keyboards, Carl Dixon on vocals and returning guitarist Bobby Bilan, who was replaced by Laurie MacKenzie in 2006.
In 2007 Bachman and Cummings began recording together; unable to use the Guess Who name, they issued the album Jukebox as "Bachman Cummings".
The Guess Who