1 ▁ ▁And ante ▁and ▁Vari ations ▁in ▁G ▁major , ▁K . ▁ 5 0 1 ▁ ▁Ad ag io ▁and ▁Al leg ro ▁in ▁F ▁minor ▁for ▁a ▁mechanical ▁organ , ▁K . ▁ 5 9 4 ▁ ▁Fant asia ▁in ▁F ▁minor , ▁K . ▁ 6 0 8 ▁( organ , ▁composer ' s ▁trans cription ) ▁ ▁Two ▁pian os ▁▁ ▁Son ata ▁for ▁Two ▁P ian os ▁in ▁D ▁major , ▁K . ▁ 4 4 8 / 3 7 5 a ▁ ▁F ug ue ▁in ▁C ▁minor ▁for ▁Two ▁Key boards , ▁K . ▁ 4 2 6 ▁( trans cribed ▁in ▁ 1 7 8 8 ▁for ▁strings ▁as ▁K . ▁ 5 4 6 ) ▁ ▁L arg h etto ▁and ▁Al leg retto ▁for ▁Two ▁P ian os ▁in ▁E ▁major , ▁K . ▁de est ▁( comple ted ▁by ▁Maxim ilian ▁Stad ler ) ▁ ▁Chamber ▁music ▁ ▁Vi olin ▁music ▁ ▁He ▁also ▁wrote ▁for ▁piano ▁and ▁viol in . ▁Note ▁the ▁order ▁of ▁the ▁two ▁instruments : ▁for ▁the ▁most ▁part , ▁these ▁are ▁keyboard - cent ric ▁son at as ▁where ▁the ▁viol in ▁plays ▁a ▁more ▁accomp any ing ▁role . ▁In ▁later ▁years , ▁the ▁role ▁of ▁the ▁viol in ▁grew ▁to ▁not ▁just ▁a ▁support ▁to ▁the ▁other ▁solo ▁instrument , ▁but ▁to ▁build ▁a ▁dialog ue ▁with ▁it . ▁ ▁The ▁' V i olin ▁Son at as ', ▁K V ▁ 1 0