In June of 1974, Chicago was touring in support of Chicago VII. Despite being a double album with a lot of adventurous, fusion based material, it was still hugely successful. They still had radio friendly singles, and had also established themselves as one of the top draws in America.
The performance was recorded on 12 June 1974 at Freedom Hall in Louisville, Kentucky and was first broadcast in SQ quadraphonic on the King Biscuit Flower Hour on 27 October 1974. This conversion includes the original announcements and advertisements.
Source: Pre-FM SQ encoded broadcast reels
Converted to: DVD-A PCM 24/48