 His relationship with two Arras trouvères is apparent in his lyrics, Guillaume le Vinier and Jehan Bretel.He is also mentioned in a work of Guibert Kaukesel, a canon of Arras.The chief characteristic of Erart's poetry is his preference for short lines, mostly penta-, hexa-, hepta-, and octosyllabic, as opposed to the traditional decasyllable, which does occur in his "chansons" "Pré ne vergier ne boscaige foillu" and "Encoire sui cil ki a merchi s'atent" and his "serventois" "Nus chanters".