What's more, Nielsen recently crowned her the top-selling digital artist in music history with more than 24 million digital tracks sold.
Tracks sold tickets in a variety of formats.
Together, the tracks sold more than 22,000 copies, according to Koch.
Apple says around half the tracks sold through iTunes are individual tracks, and half are sold in the form of complete albums.
In 2011 just 102 of the 8m digital musical tracks sold generated nearly a sixth of all sales.
All three tracks sold over a million copies within a year, a feat only the Beatles have matched.
Even so, the number of 99-cent tracks sold by these companies remains dwarfed by the free downloads still available using the likes of KaZaA and Grokster.
Still, if every 10 individual tracks sold online are counted as albums, overall recorded music sales are off only about 0.7percentthis yearar.
For years, the tracks sold by Whittle Shortline Railroad have been made by a woodworker, who decided to quit the business in May.
The Stones' "Exile," released in 1972 and reissued last week with a disc of extra tracks, sold 76,000 copies to land at No. 2. (In Britain it went straight to No. 1).
In July, the company paid a 103 million euro fine to the Federal Cartel Office in Germany after accusations it was part of a conspiracy to fix the price of railway tracks sold to Deutsche Bahn, the national railroad, and other customers.
