GRE的一道填空题，求翻译，实在对这个逻辑有点顺不清。Kepthideboundbycloyingcommercialradioandcluelessrecordexecutives,theAmericanpopularmusicscenehasfrequentlydependedoncitiesattheedgesoftheculturalmap

Question

GRE 的一道填空题，求翻译，实在对这个逻辑有点顺不清。
Kept hidebound by cloying commercial radio and clueless record executives, the American popular music scene has frequently depended on cities at the edges of the cultural map to provide a much-needed shot of originality . The momentary consensus about what the next big thing is seems to come out of nowhere—as if someone blows a whistle only those in the know can hear, and suddenly record executives and journalists are crawling all over what had previously been an obscure locale.
还有就是有没有人了解这段话的背景知识，可以说两句吗？

Answer 1

大概的意思，是表现了龟缩在角落里(edges)的一个小众群体，和主流文化（As and Bs) 之间的对比关系。
逻辑定正负，语义定方向。
先做2，3空。next big th的next 表并列，于是空2可以和come out of 联系起来，选originality。空3， As and Bs crawling all over表明一种人群的感觉，于是空三，通过语义，确定是consensus。
第一个空是用cloying这个负评价词推出来的。因为by后面会跟重点，所以hidebound是答案。