Matt Novak found an interesting quirk about the band Aerosmith’s career:

• As Centives has covered before musicians don’t actually make all that much money from selling their music.
• Instead the real money is in selling merchandise like t-shirts, or going on live tours.
• When Guitar Hero was at its peak Aerosmith made a lot of money from licensing its songs and image to the video game.
• This, in turn, meant a new generation of fans interested in their music which lead to more concert and merchandizing revenues.

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Source: Gizmodo