Chicago at Carnegie Hall box set presents an expanded version of the "free form" intro, which itself is given its own track. Various versions of the song receive airplay; the promotional single edit is the version played on certain 'Classic Hits' stations and 1970s radio shows. For example, radio station KKMJ plays the promo edit version on its 'Super Songs' of the 70s weekend, as does Classic Hits KXBT. By contrast, the True Oldies Channel plays the 3:20 single version. An AM radio station in Boston (WJIB 740 which also simulcasts in Maine as WJTO 730) plays the original vinyl Chicago IX edit. When, in 1969, a lawsuit by the actual Chicago Transit Authority forced the band to drop the “Transit Authority” part of its name, they—as they later remarked in the liner notes of their greatest-hits boxed set Group Portrait—almost sued the CTA for using this very song (to advertise their bus services) without prior permission! Composition Right after the free form piano solo, the time signature of the fanfare preceding the trumpet solo is, per bar, , , , , and , then transitions to a section in for 6 bars, then goes into for one bar. The song stays in after that. Reception Cash Box said of the song that Chicago's "exciting arrangements and superb material add up to an aural outburst that should blossom as a flowering chart entry." Personnel Robert Lamm - lead vocals, acoustic piano, spoken dialogue Terry Kath - electric guitar, backing vocals Peter Cetera - bass guitar, backing vocals Danny Seraphine - drums Lee Loughnane - trumpet James Pankow - trombone Walter Parazaider - tenor saxophone Chart performance Weekly charts Year-end charts References External links Lyrics of this song 1969 songs 1970 singles Chicago (band) songs Songs written by Robert Lamm Song recordings produced by James William Guercio Columbia Records singles