In Ando Media’s Top 20 Webcast Metrics ratings for May 2010, Pandora is again dominant with a slight month-over-month gain as all of the top five radio broadcast groups slipped slightly for the second consecutive month.

Ando observed in their accompanying press release that “most key metrics were flat to down one to two percent among the top webcasters,” but in fact the two top broadcaster groups — CBS and Clear Channel — experienced drops of over 10%.
 
But first Pandora: In the Domestic Mon-Sun 6a-12m results, Pandora saw a slight 0.4% AAS (a/k/a AQH) gain from April (326,294 from 324,886). Pandora’s AAS is now over 3 times that of second-place CBS Radio’s 105,401 AAS.
Meanwhile, CBS Radio experienced a 12% decrease in AAS from April to May in the same report (dropping from 120,043 to 105,401). Clear Channel suffered similarly, dropping 10% in AAS in the Domestic chart.
 
Overall, CBS Radio’s domestic AAS has decreased 27% since January 2010 (146,148 to 105,401) while Clear Channel is down 11% since their AAS high-point of 82,424 in March 2010.
Online-only webcas
ters held their ground with minimal gains and losses. Second-place on the “All Streams” ranker Digitally Imported, for example, rose to 56,707 AAS in May from 55,584 in April while 977Music.com (#3 in the Daypart 6am-12am, Mon-Sun ranking), rose from 35,210 AAS in April to 36,272 in May.
 
The May Domestic and All Streams charts for the Mon-Sun 6a-12m daypart are shown below. Find more from Ando Media here and read our coverage of April’s rankings here.
 
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