Elfferich Four is a dutch drums-bass-guitar trio making a new kind of progressive rock/funk/jazz. All tunes are by Jeroen Elfferich, the drummer. The grooves are all uneven which means that they don't play 1,2,3,4 anymore. The band started in the early 90's as a quartet (drums, bass, guitar plus saxophone) and made three albums: Electricity, Curiosity and Special Four. These were reissued by WM Recordings in the summer of 2006. The new Elfferich Four album Eccentricity was released on Musea Records in 2007.