Pandora's growth was particularly noticeable in "Average Active Sessions", analogous to broadcast radio's AQH. Pandora showed with about 799,000 Active Sessions in August, and now 885,078 in September. Its "cume" figure of "Session Starts" grew from 316 million to 343 million. The September numbers recorded by Triton Digital are new records for Pandora. #2 CBS Radio, which includes Yahoo Launchcast and AOL Radio, dips in both Active Sessions and Starts. (AOL Radio is in the process of leaving the CBS family and joining Slacker, but was still included for September.) #3 Clear Channel, with a big push behind iHeartRadio, is up in Active Sessions (from 122,000 to about 133,000) and Starts (from about 41.3 million to 48 million). #4 is Citadel, roughly flat (and soon to become part of Cumulus). #5 is Slacker, which is up in Active Sessions and particularly Starts (from 14.7 million to better than 15.6 million). The rest of top ten: #6 Entercom, #7 EMF (K-Love/Air 1), #8 ESPN Radio, #9 Cox and #10 Cumulus. Check the latest September Internet audio rankers from Triton Digital, the former Ando Media monthly rankers, here.