Joining eight of its predecessors, the multi-artist compilation "Now 22" bows atop The Billboard 200 this week. The BMG/Zomba/EMI/UME compilation moved 398,000 units in the United States, according to Nielsen SoundScan, a startling 300,000 copies more than the album that entered the chart at No. 2, Thom Yorke's "The Eraser."