It means that the band's track "Don't Stop Believin'" is the first song that was available in the pre-digital era to sell more than 2 million downloads through iTunes.
According to the theguardian.co.uk, part of the track's popularity is to do with it soundtracking the finale of TV hit drama The Sopranos last year.
The song was originally released in 1981, then made available through iTunes in April 2003.
For more on Journey, check out their NME.com page.
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