<P> The song is played at Saturday afternoon baseball games at Wrigley Field in Chicago (as Terry Kath grew up on the North Side of Chicago), Nationals Park in Washington, Oriole Park at Camden Yards in Baltimore, Yankee Stadium and Citi Field in New York, and Coors Field in Denver . </P> <P> The opening piano riff was sampled by Jill Sobule for her song "Cinnamon Park" on the 2004 release, Underdog Victorious . </P> <Ul> <Li> Robert Lamm--lead vocals, piano </Li> <Li> Peter Cetera--lead vocals (chorus), backing vocals, bass </Li> <Li> Terry Kath--guitar </Li> <Li> Lee Loughnane--trumpet </Li> <Li> James Pankow--trombone </Li> <Li> Walter Parazaider--alto saxophone </Li> <Li> Danny Seraphine--drums </Li> </Ul> <Li> Robert Lamm--lead vocals, piano </Li>

Who sang vocals on saturday in the park