Tonight @ BMO Harris Pavilion, Summerfest, 9:45 p.m.
The group formed in 1967 as Chicago Transit Authority, also the name of its first double-album (and the object of a subsequent cease-and-desist order from the real Chicago Transit Authority over the identity usage). Shortening its name to Chicago, the band became known for its brassy sound and, surprisingly, its popular ballads. Lineups have changed over the years, most notably with the departure of vocalist Peter Cetera. In addition to Pankow, the current iteration includes founders Robert Lamm on keyboards, Lee Loughnane on trumpet and Walt Parazaider on sax and woodwinds. The group remains second only to The Beach Boys among American bands in Billboard single and album chart toppers, and it's easy to tell that, after more than 40 years, Chicago still has the brass to make its own singular musical statement.