Scratch, a member of the illustrious Roots, is bringing the art of vocal percussion or human beat-boxing as it’s more commonly known to the fore with his solo release “The Embodiment of Instrumentation.” Instead of playing bass or drums, he replicates the sounds with his mouth.

For what is basically a musical experiment can a beat-boxer sustain an entire album? the results are surprisingly successful. An array of guests including Schoolz of Thought (Scratch’s other group), Bilal, Jill Scott and various members of the Roots handle the vocals, laying down raps, soulful singing and slam-style poetry. All the while, Scratch is creating a complex and convincing beat foundation that’s as varied as it is impressive.

l Truth Hurts has appeared as a guest on the work of Busta Rhymes and others, but “Truthfully Speaking” on Dr. Dre’s Aftermath label is the first real showcase for her talents. Working with an all-star lineup of producers such as DJ Quik, Timbaland, R. Kelly, Hi-Tek and Dre himself, she’s delivered one of the strongest albums of 2002.

Highlights include the multi-layered Timbaland-produced “Real,” the Hi-Tek guided thump of “Hollywood” and the album’s first single, “Addictive,” with DJ Quik blending Indian influences and a guest rap from microphone vet Rakim. Truth shines throughout, entertaining with what she’s described as “R&B with an edge.” And while she does indeed possess a toughness that’s readily apparent, listening to this Truth doesn’t hurt a bit.

l Longtime hip-hop fans will know Cee-Lo from his days with the Goodie Mob. Cee-Lo exploits that strength on his solo outing to great effect too, especially on the closing “Young Man (Sierra’s Song),” a cautionary soul croon that many a thug-life poseur would do well to hear. But he can also have fun with tracks like “Suga Baby” and “Closet Freak.”