Massive Attack have provided further clues to the direction of their upcoming fourth album with their remix of A Perfect Circle's "3 Libras," released in Britain this week.

Featured as a B-side to the "3 Libras" single, the "All Main Courses mix" spins the original song out to more than double its three and a half minutes, drowning it in a deep, dark collage of looped vocals, haunting keys and otherworldly echoes.

It's uncertain whether the A Perfect Circle remix, which is available for download on MTV.com, will be released commercially in the U.S., according to Virgin Records.

In remixing "3 Libras," the members of Massive Attack — Robert "3D" Del Naja and Grant "Daddy G" Marshall — ended up with two distinct songs: the remix itself and a track of their own, called "All Main Courses" — according to a post from del Naja on the group's official Web site, www.massiveattack.co.uk.

"All Main Courses" may appear on the forthcoming Massive Attack album, which will also feature vocal work from previous collaborator and former Cocteau Twin Liz Fraser along with other, as-yet-unnamed vocalists (possibly including reggae veteran Horace Andy, who has appeared on every Massive Attack full-length to date).

The "3 Libras" remix follows the band's offering late last year of a new track, "The Nature of Threat," for download on its Web site.

Other recent work for the U.K. trip-hop originators includes scoring a boxing sequence in Guy Ritchie's latest film, "Snatch," which hits theaters Stateside on January 19. The new offering won't appear on the film's soundtrack, which comes out Tuesday, though the group's single "Angel," from 1998's Mezzanine, will.

In other Massive news, the online art gallery Eyestorm.com is selling Fitting In, a limited-edition, 112-page art book featuring del Naja's paintings, photographs and multimedia artwork. Only 150 copies of the book were produced, and only 50 of those are available to the public.

As for the other 100, "Robert has basically given [them] away to friends, family and associates," explained Eyestorm's Richard Taylor.

Fitting In is available exclusively through the art site for the hefty price of $600. Each copy of the book is signed by the artist, and all profits are being donated to the British Red Cross.

Del Naja has been creating visual art since the 1980s when he was a member of the Wild Bunch, the Bristol, England, collective from which Massive Attack sprung. Originally recognized for his work as a graffiti artist, del Naja has had his pieces placed in exhibitions as well as printed in magazines and on album covers.

Massive Attack have also recorded music for an autobiographical film by British artist Marc Quinn, Taylor said. Due to be released later this year, the movie's soundtrack will feature "The Nature of the Threat."