There are multiple artists/bands with this name:
1) A Swedish power-pop band
2) A Chinese hip-hop, jazz artist 1. Nom De Guerre describe themselves as a "A piano-pounding, bass fuzzing, drum-whacking power-pop trio." And for once, a band's description of themselves is not so far off base. "So Long Sister" features some great pounding piano and stirring bass. What they don't mention are great catchy vocals and a total pop sensibility which sees them writing a short, to the point, and hook laden song.

Read more about Nom De Guerre on Last.fm.