JennieG's comment probably sums up my experience. I stopped going into MUJI shops, even though I liked MUJI products, because the only music they play is modern jazz of the most freeform (discordant to my ears) type. That music irritates and distracts me to the extent that I can't shop there. The music is clearly meant to enhance a very particular image of the shop which I don't fit. They think they don't want customers like me, but I'd bet they wish they hadn't driven my money away.