Though the use of canned laughter reached its peak in the 1960s, a few shows still retained the multi-camera tradition. In 1967, Desi Arnaz produced "The Mothers-in-Law" (NBC, 1967–69), which was recorded in front of a live audience at Desilu Studios, with a sweetening performed in post-production. A year later, "The Good Guys" (CBS, 1968–70) followed the same format. Production changes in location, however, caused the remainder of the first season to transition back to single-camera entirely, using only a laugh track. This continued through season two until low ratings led to its cancellation in 1970.