Top 40 “Bands”

I dont know all that much about music so I dont really have any comments but in keeping with my tradition of posting Guardian lists, here’s their Top 40 bands in Britain today and the Top 40 bands in the US today. I do have one question though, since when are one person acts such as Madonna, Justin Timberlake and Eminem called bands?? How about a producer like Timbaland in 3rd position? Once again, seems like a badly named list.