A probable contemporary of Machaut, Grimace's ballades, rondeau and virelai do not employ complicated or irregular rhythms. The style of the love songs does not vary from that of Marchaut and the metric length of the shortest note does not change anywhere in the music. His virelai catches the attention of analysts who note the use of imitation between the two upper voices and the accompanying voices; this was usually reserved only for the superius and the second highest voice. ~ Keith Johnson, Rovi