I found some interesting news from hyperbot.com A new study by the Stern Business College in New York states that if you blog at 40 times before a CD release that your CD sales will be 3 or 4 more the average for an indie or major label release. If blog posts crossed 250, album sales rose to six times the average regardless of label.
However, major releases that got reviews (like in Rolling Stone) also got some push. This study provides some early clues for music marketers interested in assessing the relative importance of Web 2.0 sites and metrics and suggest that looking at cumalative online action appears to provide predictive value far beyond looking at each in isolation.
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This is exactly what I was searching for on google, I guess I got my answer! lol
i have been long time searching this kind of article,finally i found this. keep posting