Rage Against The Machine vocalist Zack De La Rocha has completed his first solo album, on which he has been working on and off since first leaving the band in 2000. De La Rocha worked extensively on the as-yet-untitled project with former the Mars Volta drummer Jon Theodore.

Sources familiar with the album say it features De La Rocha playing keyboards and that the sound is a hybrid of "Led Zeppelin and Dr. Dre. Some of it has the power you'd expect from him in Rage."

A portion of the recording took place recently at Jack Johnson's new eco-friendly studio in Los Angeles. De La Rocha is understood to be unsigned and mulling offers for how to best distribute the album.

Post-Rage, De La Rocha has recorded material with DJ Shadow, Nine Inch Nails' Trent Reznor and the Roots' ?uestlove, but it is unknown if any of these tracks appear on the finished album. One song with Reznor, "We Want It All," appears on the 2004 compilation Songs and Artists that Inspired Fahrenheit 9/11.

Rage Against The Machine reunited in late April to co-headline the Coachella Valley Music & Arts Festival and has played a handful of gigs since. The lone shows left on the band's itinerary are in late October at the Voodoo Music Experience in New Orleans and the Vegoose festival in Las Vegas. --Joe Bosso