Arthur is a side project of MxPx featuring all three members of MxPx and their former tech assistant Neil Hundt, who now techs for Good Charlotte. They released an EP called Loneliness Is Bliss. The band members went by their middle names: Arthur (where the band name came from), Edmund, Zane, and Alexander (Mike Herrera, Tom Wisniewski, Yuri Ruley, and Neil Hundt, respectively).   Wikipedia