The bonus material for Taylor Swift's 1989 includes a brief rare glimpse into the studio with Martin. As she plays an unfinished "Blank Space" for him for the first time, he improvises "Ey!" and "Oh!" background shouts under the chorus (an idea that would make the final cut). Swift compares this to "an early 2000s" track by what ARTIST, probably thinking of his hit "Ride wit' Me"?