Oh man, that's tough...
I think they put out 2 albums. One was the EP called 'Popula' where the song rigors appears. But I remember another CD that was available on their website. It was described as 'more singer/songwriter' than the straight power-pop of "Popula"
Digginlilies-- Their original lead singer was 'Klaus' who, I think, still shares office-space with the Haxan guys. So, this would be one place to ask about the Popula ep. Klaus's site is: http://www.juicytemples.com/web2004/
He does som ereally inventive & amazing design-type stuff.
I think the band changed its name to 'Gasganno' after Klaus left to focus on design... Here's their ste:http://www.gasganno.com/
But their news page hasn't been updated since late 2002.... bad sign.