From Corey Deitz,
Your Guide to Radio.
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Arbitron and comScore Media Metrix have released the online radio ratings for December 2005.

More than seven million different people, age 12 and older, tuned to the online radio during an average week in December, Monday to Sunday from 6AM – 12 midnight.

This is the first time the Cume audience for the five measured networks surpassed seven million listeners during an average week in a given month. (What is Cume?)

The midday Average Quarter-Hour (AQH) audience – listening Monday through Friday from 10AM-3PM – for the online radio networks being measured reached a new high of 1,832,300 people, age 12 and older. (What is Average Quarter Hour?)

The December ratings analysed listenership on Yahoo Music, American Online's AOL Radio Network, Microsoft's MSN Radio and WindowsMedia.com, and Live365

Ratings for all services can be viewed below.

Persons 12+ Average Weekly Audience - December, 2005

Listener Measurement
Networks		Monday-Friday 6AM-7PM Cume Persons	Monday-Friday 6AM-7PM - Average Quarter - Hour Persons	Monday-Sunday 6AM-Midnight - Cume Persons	Monday-Sunday 6AM-Midnight - Average Quarter- Hour Persons
	America Online's AOL Radio Network	1,169,000	359,500	1,877,900	228,500
	Clear Channel Online Music and Radio	663,700	106,000	797,300	58,600
	Live365	523,900	79,400	721,200	47,800
	Microsoft’s MSN Radio and WindowsMedia.com	935,200	223,200	1,116,900	121,100
	Yahoo Music/LAUNCHcast	1,788,900	466,500	2,759,100	280,900
	TOTAL: All Five Networks	4,849,500	1,234,500	7,000,500	736,900

What is Cume?
What is Average Quarter Hour?