Jermaine Clement and Bret McKenzie have admitted that coming up with new songs for New Zealand's former "fourth most popular guitar-based digi-bongo acapella-rap-funk-comedy folk duo" has proved difficult.
The first 12-part series, which aired on BBC4 last year, brought to life 25 songs that had been honed on the festival circuit, some of which had already appeared in the duo's Radio 2 series.
The TV series also included an episode written by UK comedy writers Damon Beesley and Iain Morris, who went on to create E4's first sitcom, The Inbetweeners.
In preparing the second, 10-part series, Clement told music magazine Q: "We've got a lot of half-songs. We've got an album's worth of beginnings of songs."
McKenzie added: "The second series seems to me like it would be a good end to the show. I feel like another 10... that will be enough."
HBO is due to air the second series in January. The BBC has yet to say when it will broadcast it.