Guidebooks that tell you what to put on your iPod are ubiquitous these days. The album guide (yesteryear’s Rolling Stone and Trouser Press volumes) has been replaced by the playlist recommendation tome. They are flooding the market and aim to be definitive, but the Rough Guide entry is the best of the current batch. With characteristic Rough Guide depth, The Best Music You’ve Never Heard aims to highlight lesser known but very worthy artists across a wide array of genres such as rock, indie, alt-country, soul, blues, folk, electronic and more. That broad-based approach to culture is bound to appeal to PopMatters readers, even if many of these artists are, in fact, already well-known by our savvy audience.