Salinas, Calif. - Web-based music radio services generated 4.85 billion total listening hours in 2007, a 26% increase over 2006, according to a report from AccuStream iMedia Research.

Total listening hours averaged 404.2 million hours per month, compared to a 320.5 million hour average in 2006.

AOL's Shoutcast remained the top platform for Internet music radio, claiming 48% of total listening hours for the year, and was followed by Clear Channel Online, Yahoo Music, AOL Radio Networks and Pandora.

The Internet music radio ad market was worth approximately $92 million in 2007, including $80 million in audio ads -- a 194% increase from 2006 -- and another $12-$15 million generated through video ads placed within radio sites.

AccuStream credited online commitments from terrestrial broadcasters such as Clear Channel and Citadel Broadcasting in part for the improved ad market for the medium, but noted that the top ten radio sites still captured over 90% of total listening hours monthly.

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http://www.accustreamresearch.com