The Big Thing played its first engagement at the GiGi A-Go-Go in Lyons, Illinois, in March 1967. In June, July, and August, the band appeared in Peoria, Sioux Falls, South Dakota, Rockford, and Indianapolis. But the most important early gig was a week-long stand at Shula's Club in Niles, Michigan, from August 29 to September 3.

In Niles, they arranged a meeting with Parazaider's old friend Jimmy Guercio, who had become a producer for CBS Records. "He heard us play," Parazaider recalls "He was very impressed." It was the big break they had been looking for. Guercio told the band to hang on, that he would be in touch. Encouraged by this, they began to develop more of their own original material. "I began to write songs," says Pankow. "Robert began to write more songs, and Terry Kath began to contribute material."

Meanwhile, the Big Thing stayed on the Midwest club circuit through the fall, building a following. An engagement during the second week of December proved to be another important gig. "We were an opening act at Barnaby's in Chicago for a band called the Exceptions, which was the biggest club band in the Midwest, and we stuck around and listened to them," says Pankow. "I was just blown away."

If the Big Thing had stayed late to see the Exceptions, one of the Exceptions had come early to see the Big Thing. "I had heard a lot about these guys," says Peter Cetera, then the bass player for the Exceptions. "I was just floored 'cause they were doing songs that nobody else was doing, and in different ways. They were doing the Beatles' "Magical Mystery Tour" and "Got To Get You Into My Life" and different versions of rock songs with horns." After the gig, says Pankow, he approached us and said, "I don't know what you guys are doing, but I like it. It's really refreshing. It's cool." "At the end of the two-week stint, " says Cetera, "I was out of the Exceptions and into the Big Thing."

Peter Cetera was born in Chicago on September 13, 1944, and his first instrument was the accordion, which he took up then he was ten. "That's unfortunately true," he admits, when asked about it. "There was accordion and guitar, and for some reason I chose accordion. I don't know why. I guess because I was half Polish, and we played a lot of polkas. It didn't do me any good for my rock 'n' roll career, but it actually was a lot of fun."

His more serious musical career commenced a little later. "I started listening to music," he recalls, "and when I was a sophomore in high school, I bought a little guitar from Sears and started singing at the school functions. I met a senior who played guitar, and we started singing together." He said, "Let's start a group," and I went, "Fine, I'll buy a bass." We played all the Homecoming dances and all the weekend dances, doing Top 40 material. My senior year, I got together with the Exceptions. I stuck with them for five or six years."

Cetera perfectly fit the musical needs of the Big Thing. "We needed a bass player at the time," notes Loughnane. "Robert was playing the bass pedals on the organ. He did a pretty good job, but there just wasn't enough bottom with the bass pedals. You needed a real bass in the band. And we needed a tenor voice. We had two baritones (Lamm and Kath), so we had midrange and lower notes covered. But we needed a high voice for the same reason that you have three horns. You have trumpet, tenors and trombone. You cover as much range harmonically as you can, and we wanted to do the same thing vocally. When Peter joined the band, that solidified our vocals. You could get more color, musically, and we started building from there."

It was probably at the Big Thing's next appearance at Barnaby's, March 6 - 10, l968, that Guercio came back for a second look. Impressed by the band's improvement, he took action. "He told us to prepare for a move to L.A.," says Pankow, "to keep working on our original material, and he would call us when he was ready for us."