Arbitron and Infinity Broadcasting Reach Multi-Year Agreement for Radio Rating Services.

NEW YORK -- Arbitron Inc. (NYSE: ARB) today announced that it has reached an agreement with Infinity Broadcasting Corporation, a division of Viacom Inc., (NYSE: VIA and VIAB) for a multi-year contract including radio ratings and other related services for its 185 stations.

This agreement, which is effective immediately, gives Infinity Broadcasting access to Arbitron quarterly radio ratings in 42 markets including the Spring 2004 survey.

Steve Morris, president and chief executive officer, Arbitron Inc., stated, "Our goal all along was to reach a mutually beneficial agreement with Infinity and to maintain our long-term relationship with the company and with its people. We look forward to providing Infinity with our Media Rating Council (MRC) accredited ratings services and the other widely accepted information services which Infinity can now use to get the most revenue for the audience that they deliver to advertisers."

"This announcement is about Infinity's commitment to improving and innovating radio's audience measurement methodologies and delivering the most efficient research to our advertisers," said Joel Hollander, President and Chief Operating Officer, Infinity Broadcasting. "We look forward to advancing rating services for the industry in the future."

About Infinity

Infinity Broadcasting is one of the largest major-market radio operators in the United States, with stations covering the news, modern rock, oldies, country, FM talk, classic rock and urban formats. Infinity owns 185 radio stations, the majority of which are in the nation's top 50 markets and reach more than 70 million listeners a week and is also home to 29 of the country's leading sports franchises amongst the NFL, MLB, the NBA and NHL.

About Arbitron

Arbitron Inc. (NYSE: ARB) is an international media and marketing research firm serving radio broadcasters, cable companies, advertisers, advertising agencies and outdoor advertising companies in the United States, Mexico and Europe. Arbitron's core businesses are measuring network and local market radio audiences across the United States; surveying the retail, media and product patterns of local market consumers; and providing application software used for analyzing media audience and marketing information data. The Company is developing the Portable People Meter, a new technology for radio, TV and cable ratings.

Arbitron's marketing and business units are supported by its research and technology organization located in Columbia, Maryland. Arbitron has approximately 1700 employees; its executive offices are located in New York City.

Through its Scarborough Research joint venture with VNU Media Measurement & Information, Arbitron also provides media and marketing research services to the broadcast television, magazine, newspaper and online industries.

This press release contains forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. The statements regarding Arbitron in this document that are not historical in nature, particularly those that utilize terminology such as "may," "will," "should," "likely," "expects," "anticipates," "estimates," "believes" or "plans," or comparable terminology, are forward-looking statements based on current expectations about future events, which Arbitron has derived from information currently available to it. These forward-looking statements involve known and unknown risks and uncertainties that may cause our results to be materially different from results implied in such forward-looking statements. These risks and uncertainties include whether we will be able to:

--renew all or part of contracts with large customers as they expire;

--successfully execute our business strategies, including implementation of our Portable People Meter services, as well as expansion of international operations;

--effectively manage the impact of further consolidation in the radio industry;

--keep up with rapidly changing technological needs of our customer base, including creating new products and services that meet these needs;

--successfully manage the impact on our business of any economic downturn generally and in the advertising market in particular; and

--successfully manage the impact on costs of data collection due to privacy concerns and/or government regulations.

Additional important factors known to Arbitron that could cause forward-looking statements to turn out to be incorrect are identified and discussed from time to time in Arbitron's filings with the Securities and Exchange Commission, including in particular the risk factors discussed under the caption "ITEM 1. BUSINESS - Business Risks" in our Annual Report on Form 10-K.

The forward-looking statements contained in this document speak only as of the date hereof, and Arbitron undertakes no obligation to correct or update any forward-looking statements, whether as a result of new information, future events or otherwise.