100 Chillout Classics, one in a series of five-disc various-artists compilations that also includes 100 R&B Classics and 100 Garage Classics, features lots of genuine classics and boasts tremendous value. With an advertised price point of a mere ten pounds, this 100-track package is an economical way to bulk up your music collection, particularly if you rip the CDs to your computer, cherry-pick the tracks of your liking, and discard the filler. The problem with 100 Chillout Classics is that "chillout" is a slippery term that means different things to different listeners. Within the context of this compilation, chillout ranges -- sometimes maddeningly -- from Fatboy Slim and Primal Scream to the Isley Brothers and All Saints. While some may consider Massive Attack and Portishead to be chillout music, others may consider Antonio Carlos Jobim and Brian Eno to be chillout. Fortunately, 100 Chillout Classics does a good job of compartmentalizing its different styles of music. The first three discs tend to be comprised of downtempo electronica, with about half of the tracks remixed. Highlights of the first disc include Morcheeba's "The Sea," Groove Armada's "At the River," and Moloko's "Sing It Back." Highlights of the second disc include William Orbit's "Adagio for Strings," Olive's "You're Not Alone," and Nightmares on Wax's "Les Nuits." Highlights of the third disc include Faithless' "Drifting Away," Orbital's "Belfast," and the Future Sound of London's "Papua New Guinea." In contrast, the fourth and fifth discs tend to be comprised of acoustic pop and downtempo R&B, once again with many of the tracks remixed. Highlights of the fourth disc include Jason Derülo's "Watcha Say," Jason Mraz's "I'm Yours," and Angie Stone's "Wish I Didn't Miss You." Highlights of the fifth disc include Damien Rice's "The Blower's Daughter," New Order's "Elegia," and Lou Reed's "Perfect Day."