Digital distributor TuneCore posted some revealing statistics on its blog on Wednesday.

-- The top line numbers: In 2009, TuneCore artists grossed over $35 million from 26.2 million track downloads, 1.47 million album downloads and 37.5 million streams.

-- Rock was TuneCore's best selling album genre with 16% of sales. Alternative (13.5%) and hip hop (12.2%) were second and third, respectively. New age is fifth with a little over 6%. Further down the list, Latin, children's music, holiday, Americana, vocal and blues each constitute 1% of less of TuneCore's album sales. Since TuneCore did not indicate what percent of its total catalog each of these genre represent, we don't know if any one of them is underperforming or overperforming relative to its share of the catalog.

-- Rock was also TuneCore's top selling single track genre with 23% of sales. Alternative (18%) and pop (12.5%) were second and third, respectively. Country was seventh with about 4% of track sales - much higher than its 2% of album sales.

-- Hip-hop was the top streaming genre (it was third in albums and fourth in tracks) with a 23% share. Alternative (13%) and rock (12%) were second and third, respectively.

-- Manhattan, Chicago, Houston, Los Angeles and Brooklyn were the top five TuneCore markets for the period November 2009 to April 2010. Also high on the top 25 were Austin, San Diego, Seattle and San Francisco.

-- On a per-capita basis, Minneapolis, St. Paul, Orlando, Miami and St. Louis were, in order, were the top five TuneCore markets. Brooklyn, with a population of 2.5 million, ranked 22nd while Los Angeles fell to 25th. To calculate the per-capita revenue, I took total revenue for the market (which I had to eyeball from a bar graph, so there may be small errors) and divided by the latest city (not metro) population listed on each Wikipedia page.

-- Sunday and Saturday were the first and second best sales days, respectively. Friday was third best and Tuesday - new release day - was fourth. There's something to learn for digital marketing. Get people on a weekend. They're obviously busy during the work week.