Wall Street Journal: When CBS makes a new TV show, it shows it to an audience to gauge reaction at its Las Vegas research facility dubbed Television City. Now CBS wants to make Television City available to advertisers, so they can determine if their commercials are hitting the right notes with viewers. Access to Television City is just one part of a new initiative at CBS called Campaign Performance Audit that the network said will help advertisers determine if they are getting a big enough bang for their buck.