@techreport{NBERw13308,
 title = "From "White Christmas" to Sgt. Pepper: The Conceptual Revolution in Popular Music",
 author = "David Galenson",
 institution = "National Bureau of Economic Research",
 type = "Working Paper",
 series = "Working Paper Series",
 number = "13308",
 year = "2007",
 month = "August",
 URL = "http://www.nber.org/papers/w13308",
}