They play marginally talented singer/songwriters on their runaway hit HBO series, but Flight of the Conchords members Jermaine Clement and Bret McKenzie put in extensive time in the studio to perfect

They play marginally talented singer/songwriters on their runaway hit HBO series, but Flight of the Conchords members Jermaine Clement and Bret McKenzie put in extensive time in the studio to perfect their self-titled Sub Pop debut, due April 22.

All the tracks have appeared on the show, but Sub Pop A&R honcho Tony Kiewel tells Billboard they've been "massively reworked and totally re-arranged." The synth-pop parody "Inner City Pressure" is likely to be the first single, and the label is now selecting 10 or 12 songs from a possible 15 to form the track list.

"The idea is to find a tiny window of opportunity to get the band available to do stuff in between writing and shooting" the second season of the HBO show, Kiewel says of the Conchords' busy schedule. "They're involved in every aspect of the show's production."

Last week, the group's debut EP, "The Distant Future," received a Grammy nomination for best comedy album. But the easy-going Clement admitted to Billboard in August that he was a bit baffled to find himself at the center of all this attention. "Sometimes I'm really surprised I ended up being a performer," he said. "In a lot of ways, I've got a job that doesn't suit me. I'm not a particularly social person or the life of the party, but somehow it's ended up that way."