The artist-specific compilation almost seems like a useless gesture in the digital age. Now that anyone can buy a song for around a dollar, there's seemingly no need to buy a CD full of singles for more than pocket change. That's simply not true, though; such discs represent more than just songs everyone loves. It's ideally the chronicle of hard-earned success within a lengthy body of work. It's sometimes a chance to visit a catalogue unified by certain musical or lyrical themes. And for