Here's a strange iTunes recommendation.  Based on the items in the 
shopping car:  'Selected Chants of the Russian Orthodox Church'  and 'A 
Gregorian Chant' by Benedictine Monks, iTunes is recommending Green Day,
 Interpol, The Mars Volta, Velvet Revolver Joni Mitchell, and Amy 
Winehouse.  Me thinks they are having a bit of a sparse data issue here.
  Not enough people have listened to Gregorian chants to allow iTunes to
 tap into the wisdom of the crowds.