The U.K.'s Now series features timely selections of pop hits and provides a convenient way for casual pop fans to stay on top of the most popular singles. The sets are almost always naturally well-rounded, encompassing dance music, R&B, hip-hop, teen pop, and rock. And though they might expire, in a sense, since they're based on trends in pop music, they work as more than adequate snapshots of specific points in time. Vol. 45, released in 2000, includes Britney Spears' "Born to Make You Happy," Montell Jordan's "Get It on Tonite," Moloko's "The Time Is Now," Sisqó's "Thong Song," Robbie Williams' "It's Only Us," Moby's "Natural Blues," Steps' "Say You'll Be Mine," and Aqua's "Cartoon Heroes."