sentence: track listing personnel peter cetera - bass , vocals , agogo bells terry kath - electric guitar , acoustic guitar , vocals robert lamm - acoustic piano , hammond organ , hohner pianet electric piano , wurlitzer electric piano , vocals , maracas lee loughnane - trumpet , claves james pankow - trombone , cowbell walter parazaider - woodwinds , tambourine danny seraphine - drums , percussion charts the chicago transit authority ( columbia 8 ) reached # 17 in the us during a chart stay of 171 weeks .