- 问题详情:Recordedbackgroundmusicfirstfounditswayintofactories,shopsandrestaurantsintheUSA.Butitsoonspreadtootherpartsoftheworld.Nowitisbecomingincreasinglydifficulttogoshoppingoreatamealwithoutlisteningtomusic.Thebest-knownsupplierofbackgroundmusicisanAm...
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