Additional personnel: Norah Jones (vocals, piano); Josh Homme, Joe Beebe (guitar); John Paul Jones (mandolin, piano); Petra Haden (violin); Danny Clinch (harmonica); Rami Jaffee (keyboards); Nick Raskulinecz (double bass, bass guitar).

Although it was as big a commercial success as Foo Fighters' three previous albums, 2002's One by One seemed flat and tired, as if their leader, Dave Grohl, had reached a songwriting slump or as if the band had exhausted its possibilities. The time was ripe for a reinvention, or at least a risk, and the group responded accordingly with In Your Honor, a double album containing one disc of hard rock and one disc of acoustic material. Splitting music along such a clear dividing line is dangerous: since each disc explores one specific territory, each could sound monochromatic, but instead of falling into this trap, Foo Fighters benefit from these self-imposed constraints. Both the rock and acoustic albums have their own distinct character -- more so than, say, Guns N' Roses' separately released Use Your Illusion's, which felt like one gigantic sprawling album -- and while each is recognizably the work of Foo Fighters, neither feels as formulaic as One by One. While the acoustic album would seem to be the biggest break from tradition -- not only does it have a hushed, subdued mood, but it's filled with guest stars, including several appearances by Led Zeppelin's John Paul Jones, a duet with Norah Jones on "Virginia Moon," and Queens of the Stone Age's Josh Homme returning the favor of Grohl's drumming on Songs for the Deaf by laying down guitar on "Razor" -- both albums showcase a reinvigorated band that is eager to stretch out and experiment. As such, the rock album not only hits much harder than One by One -- arguably, it rocks harder than any of their other records -- but its has fluid musicality and a new found sense of drama that gives it a nearly cinematic sense of scope. Naturally, the acoustic album is quieter, but it also has a similar flow and easy grace that makes it a fitting complement to the harder first record. Previous Foo Fighters albums have had the problem of being a little inconsistent, both in terms of material and in terms of maintaining a consistent sound, but here, perhaps because of the focused direction of the two albums, they not only sustain a consistent mood on each record, but the songs on each are strong, hooky, and memorable. Which means that In Your Honor pulls off a neat trick: by stretching out, Foo Fighters not only have expanded their sound, but they've found the core of why their music works, so they now have better songs and deliver them more effectively. It makes for certainly their most consistent, arguably their best album yet. [In Your Honor was released in two editions: a copy-protected CD that will not play on your computer without installing a separate media player, and a DualDisc, containing a CD on one side and a DVD on the other. The DualDisc has a 5.1 mix version of the album on the DVD side, along with a very informative and entertaining documentary about the making of the album, tracing it from pre-production through the construction of a studio and to the recording of the two albums. The CD side of the DualDisc may not register on some computers.] ~ Stephen Thomas Erlewine

Foo Fighters continue to redefine the parameters of the post-grunge rock world with their fifth album, IN YOUR HONOR. Dave Grohl and company flesh out their impressive canon with a two-CD set--the first disc plugged-in and packed with screaming guitars and vocals, while the second disc showcases the band's more acoustic and ethereal side. The loud-soft-loud dynamic approach of Grohl's former band for resonates quite a bit through Disc One. "Free Me" turns the distortion down briefly before pile-driver rhythms and Grohl's relentless guitar riffs dovetail smoothly into quirky-yet-effective time changes. Reflecting the personal tumult of recent years are the anthemic "Resolve" and the indignant kiss-off "The Last Song," with its AC/DC-flavored attitude and stomping cadence.

Disc Two's mellower offerings are no less intriguing, showing the band's stylistic range. "Another Round," with its mix of harmonium, harp, and mandolin could easily be mistaken for a Counting Crows outtake, and the dueling acoustic guitars on "Razor" are more Leo Kottke than Kyuss. IN YOUR HONOR shows that a hard-edged musical attack and deft songwriting need not be mutually exclusive.