Blues (First recorded version with scratch vocal)" (Kath) – 5:28 "Dialogue (Part I & II) (Single edit)" (Lamm) – 5:02 Personnel Chicago Robert Lamm – acoustic piano, Hammond organ, Fender Rhodes, Hohner Pianet, lead and backing vocals Terry Kath – electric and acoustic guitars, lead and backing vocals Peter Cetera – bass guitar, wah-wah bass, lead and backing vocals James Pankow – trombone, percussion, backing vocals, brass arrangements Walter Parazaider – saxophones, flute, percussion, backing vocals Lee Loughnane – trumpet, flugelhorn, percussion, backing vocals Danny Seraphine – drums, congas, antique bells, percussion Production Produced by James William Guercio Engineered by Wayne Tarnowski Logo Design – Nick Fasciano Album Design – John Berg Photography – Jim Houghton and Earl Steinbicker Lettering – Beverly Scott Remastering – Joe Gastwirt Charts Certifications References Chicago (band) albums 1972 albums Albums produced by James William Guercio Columbia Records albums Albums recorded at CBS 30th Street Studio