The Spice Girls' 'Stop' has clear Motown influences but it isn't strictly Motown. I'm assuming, like in previous years, "Motown Week" is basically songs from the classic Motown era i.e the sixties (on the most part) that were released via Tamla Records. The Supremes, Temptations, Ronettes, Gladys Knight & The Pips... But then this is The X Factor and they do bend the theme rules if they have a certain song that loosely fits the genre in mind. With that said, I wouldn't be surprised if Mercy or an Amy Winehouse BTB track was chosen this week.