An AQH rating - not a share - of 1.0 means at least 1% of the population in a given area listened for at least five minutes during a 15-minute period, between 6am and midnight. Pandora says that based on Edison Research data for those aged 18-34, it has attained that level in each of the top 10 markets, plus Portland, Oregon. It says that between January 6, 2011 and January 4, 2012, "Pandora experienced 50% to 100% growth in AQH ratings in all the top radio markets for adults ages 18-34 and 18-49, with the largest gains in the New York, Atlanta, Dallas-Ft. Worth and Boston metro survey areas." It has a 1.2 holiday-book AQH rating in L.A., San Francisco, Washington DC and Portland, and a 1.1 in Dallas and Boston.

As for cume, or reach: Pandora says that during the period identified as the "holiday book", its weekly cume hit "more than 22% in each of the top local metros." Atlanta (up 75%), Dallas (up 74.7%), Philadelphia (up 72.4%) and New YOrk (up 70.7%) had the largest full-year increase.

Internet audio service Pandora continues a series of Edison Research-based reports about its local audience in the largest markets. Read the latest press release from Pandora here.