LOS ANGELES (Billboard) - Life after System of a Down has been pretty good for Serj Tankian.

Stepping away from the chart-topping Los Angeles-based hard rock band, which went on indefinite hiatus in 2006, the singer/songwriter/political activist launched a solo musical career with the release of 2007’s “Elect the Dead.” The rock-driven set debuted at No. 4 on the Billboard 200 and has sold 319,000 copies, according to Nielsen SoundScan.

In addition to touring and promoting his solo music, Tankian has spent recent years writing new songs, overseeing his label, Serjical Strike, promoting various causes, publishing books, producing albums and scoring music for films, TV and videogames -- a lifestyle he never had time for while fronting System of a Down.

“I feel like I’ve established myself as an artist aside from System of a Down, and I’m comfortable with that,” Tankian says, noting that the group regularly receives offers to perform but that no such plans are in the works. “It’s been very emancipating and confidence-building.”

Now, with nearly three years under his belt as a solo artist, and amid numerous other side projects, Tankian is prepping the release of his second album, “Imperfect Harmonies,” due September 21 on Serjical Strike/Reprise Records. This time around, he moves further away from the heavy-hitting sound he’s become known for with SOAD and “Elect the Dead” and delves deeper into elements of electronica, orchestral music and jazz.

“In one way it’s really modern, with the electronics stuff, but it’s also really classical, with the legato orchestra,” Tankian says. “The core of the songs are still rock-based songs with some jazz influences here and there.”

SOMETHING NEW

It’s uncertain whether Tankian’s fan base, which largely consists of SOAD die-hards, will remain loyal to his evolving musical direction. So far, first single “Left of Center,” which features a big rock chorus and chunky guitars, hasn’t gained any traction on rock radio. “Elect the Dead” has spawned such radio successes as “Empty Walls” (which peaked at No. 3 on the Alternative chart and No. 4 on Active Rock) and “Sky Is Over” (which peaked at No. 22 on Alternative and No. 24 on Active Rock).

But at this point in his career, Tankian, 42, says he’s more concerned about following his own musical interests than with how many albums he sells. “When I die, I’m not going to care whether I’ve sold X number more records or less,” he says. “I’m going to care if I made the right expressions, if I explored enough and did something new, and put something new on this planet.”

Nevertheless, Tankian was hard at work earlier this summer preparing fans for his symphonic transition by performing numerous concerts with backing orchestras in Europe. The idea stemmed from an invitation in 2009 from New Zealand’s Auckland Philharmonia Orchestra to perform a symphonic version of “Elect the Dead.” The Auckland Town Hall performance resulted in the “Elect the Dead Symphony” project, which was released on CD/DVD in March.

“We wanted something that Serj’s core fan base could hold onto and have one more piece of ‘Elect the Dead’ before transitioning into the new record and putting his face out there in between,” manager George Tonikian says.

Tankian says performing with the New Zealand orchestra was an inspiration for much of the symphonic songwriting on “Imperfect Harmonies,” and his camp hopes to build buzz around the album through more live performances with orchestras during his European and North American tours between August and October.

He already has several other projects lined up. His musical “Prometheus Bound” is scheduled to open in March 2011 at the American Repertory Theater in Cambridge, Mass., and he’s finishing up a “classical jazz symphony” that he hopes to premiere next year. The forthcoming year may also find the artist publishing a second poetry book, “Glaring Through Oblivion,” and starting work on a nonfiction title.

Beyond all this, Tankian says he’d someday like to score a film and record an instrumental jazz album, adding, “I want to try one of everything.”