Muddy Waters records in Chicago ‘Fathers and Sons,’ a double album (1969)
Muddy Waters' 'Fathers and Sons' is a double studio album recorded on April 21–23 and 24, 1969 in Chicago and released in August 1969 by Chess Records.
Chicago release their third (and double) album : ‘Chicago III’ (1971)
Chicago's 'Chicago III' is their third studio album released as a double album on January 11, 1971.