http://www.itfacts.biz/2007-us-music-sales-by-genre/9354 this is for 2007 obviously. The data is from neilson soundscan.
Rock sales in 2007 were 149,414 compared to rnb 95,555 and rap at 41,662.
Not only that but in those years rock declined less then the other genres besides jazz, sountracks and new age.
Such a huge lead could not be destroyed in two year. And as already mentioned rock declined less then the nearest genres. So unless you can provide me a source proving rock has fallen off by rediculous levels then I doubt much has changed.







