A lot of industry vets actually believe this, and like everything, there is a hint of truth in it all.
But then how to do you account for Mumford and Sons new album Bable being the biggest release of 2012 so far with sales of over 600,000 in the first week of release? How do you account for the fact that there's been over 8 million listens of the album on Spotify so far, shattering the record for number of streams in a week? How do you account for the fact that new records by superstars Green Day, No Doubt, Justin Beiber, Nicki Minaj, Madonna and Pink have only sold a quarter (if that) of what Babel sold, despite wider ranging publicity campaigns? How do you account for the fact that the Mumfords did this all without a hit single?
When it comes right down to it, there are two principles at work here that are perennial. They've worked in the previous eras of the music business and they work now:
1) Your music is your marketing. I preach this in the Music 3.0 Internet music guidebook and it holds true on any level. An artist can only build a brand by repeated listens, either through radio airplay, torrents, piracy, streams, downloads and anything else you want to put in here. The more people hear your songs, the more likely you'll find an audience for them.
Music is a marketing tool for the artist. If no one hears it, they won't buy it, or buy merch, or go see an artist in concert. If you limit the way they listen, you limit your marketing ability.
It's important to remember that most major artists never made their fortunes from the sales of music itself. In fact, there are numerous studies that show that record sales were never more than 5% of a major artist's revenue stream. For an artist to cut off Spotify because of the peanuts for royalties pay scale totally defeats the purpose of the service to an artist's brand, as Mumford experience brilliantly illustrates here.
2) Best-selling, long lasting music goes against the grain. Record labels love to follow trends, but they rarely set them. Music history is made by artists who refuse to follow the "hit" formula and choose to follow their hearts and their art instead. Most major artists that have a long lasting career are initially outliers that the industry broadly rejects (the biggest case in point is The Beatles), only to be found by the audience directly.
The English folk music of Mumford and Sons is so far away from the mainstream that the fact that they've had a hit with their first album (Sigh No More) and look to have an even bigger one with Babel is a shock, but it proves the point. The audience found the music before the industry did, and the music doesn't following what's currently considered the norm.
And how about Adele? Her 21 now has sold over 24 million worldwide and is about as far away from what's considered the mainstream today as you can get. But people the world over love it because for exactly that reason. It comes from the right place - the heart.
The moral here is that so many of the industry "truisms" aren't actually true at all, but the two above do seem to stand the test of time.
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and Eserpanza Spalding all saw big iTunes gains after their performances on Sunday's show (see the chart on the left). 
saw spikes as high as 156% for some songs.
65 CD set (yes, 65 discs) and sold out their 7200 unit run in 4 days - at $450 each. That's $3.3 million dollars, an amount that any record label would kill for these days.