THE ADSERTION NETWORK JOINS ARBITRON'S INTERNET BROADCAST RATINGS

NEW YORK, May 29, 2003 – The Adsertion Network, an Internet radio advertising sales organization, joins Arbitron's Internet Broadcast Ratings. The Adsertion Network was ranked the number five Internet Broadcast Network with 1,209,314 hours of Total Time Spent Listening (TTSL) – the sum total of hours tuned by listeners to a given station or network – for the week of May 12. Live365 was ranked the number one Internet Broadcast Network with 3,160,752 hours of TTSL. LAUNCH, the music destination on Yahoo!, was ranked number two with 3,096,631 hours of TTSL. Chaincast/StreamAudio was ranked number three with 1,623,812 hours of TTSL. MUSICMATCH Artist Match was ranked number one with 335,350 hours of TTSL. JazzFM was ranked number two with 251,737 hours of TTSL. Virgin Radio was ranked number three with 247,702 hours of TTSL. As Arbitron's Internet Broadcast Ratings (powered by MeasureCast technology) transitions to a subscription-only service, some stations previously reported in the ratings have elected not to subscribe to the service and will no longer be included. The ratings may not reflect all tuning for the measured stations or channels since Arbitron may have received incomplete or unusable server data.

Demographic Highlights for the Week of May 12 – May 18

• The peak listening day was Wednesday, May 14, with 19 percent of the week's online listening.
• 77 percent of weekly online listening took place between 5 a.m. and 5 p.m. Pacific time.
• 12 percent of the week's total listening took place during the weekend.
• 85 percent of the measured listeners were between the ages of 18 and 54.
• 70 percent of listeners were men; 30 percent were women.
• In the U.S., 34 percent of listeners resided in the South; 30 percent in the West; 18 percent in the Northeast; and 18 percent in the Midwest.

Top 10 Internet Radio Networks (May 12 - May 18)

The Arbitron MeasureCast Weekly Top 25 (May 12 - May 18)

Notes:
1. TTSL (Total Time Spent Listening), sometimes referred to as Aggregate Tuning Hours (ATH), is the total number of hours tuned to a given station or network in the reported time period.
2. Cume Persons is an estimate of the total number of unique listeners who had one or more listening sessions lasting five minutes or longer during the reported time period. This estimate is derived using an algorithm that takes into account unique media player GUIDs, unique IP addresses and other variables during the reported time period.
3. The 128K stream for Virgin Radio/1215 AM & 105.8 FM is not currently measured by Arbitron's Internet Broadcast Ratings.

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. Arbitron Internet Broadcast Services measures the audiences of audio and video content on the Internet, commonly known as webcasts. The Company is developing the Portable People Meter, a new technology for radio, television and cable ratings.
Arbitron's marketing and business units are supported by a world-renowned research and technology organization located in Columbia, Maryland. Arbitron has approximately 825 full-time employees; its executive offices are located in New York City.
Through its Scarborough Research joint venture with VNU, Inc., Arbitron also provides media and marketing research services to the broadcast television, magazine, newspaper, outdoor and online industries.
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