"SexyBack" by Justin Timberlake featuring Timbaland tops the 4 million mark in digital sales this week. It's Timberlake's biggest hit; Timbaland's second biggest, following "Apologize" (featuring One Republic, 5,456,000). "SexyBack" was a game-changer for Timberlake, who has said that, with this song, fans stopped asking him when *NSYNC was going to get back together and starting asking when his next album was coming out.
