Olivier Demers of Le Vent du Nord, Andre Brunet of De Temps Antan and
Pascal Gemme of Genticorum are all great young fiddlers playing traditional Quebecois music. Ti-Jean Carignan is a master of that genre and well worth listening to.
By the way Grand Derangement is an Acadian band not Quebecois and not really a traditionl band but well worth listening to. Other good Acadian bands with fiddlers are Vichten, Tradition and Suriot.