There aren't too many artists that can say they have had two extremely successful careers. Peter Cetera is one that can. An original member of the rock 'n roll band with horns, Chicago, Cetera helped the band score five number-one albums and 21 top-ten singles. His solo career hasn't been too shabby either. Six Top 40 singles, including two that reached number 1. He brings those hits to the Union Colony Civic Center (UCCC) in Greeley Saturday night.