From Studio Briefing:
CBS brought out the Broadway cast of Chicago to serenade advertisers who got a look at the network's planned programming for the first time at the network's Carnegie Hall presentation Wednesday. At one point they concluded a number, to the tune of "All That Jazz," this way: "Come on babe / It's time to pay upfront / We want your clients' cash / If we may be so blunt / You've gotta buy today / Or else you'll really pay / For all. Those. Ads."