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It is this tendency to play with manic enthusiasm on every possible occasion that distinguishes the amateur jazz musician from the professional, often to the public detriment of the latter, who are regarded as snooty and unfriendly.

正是这种在任何可能的场合都以狂热的热情演奏的倾向，将业余爵士音乐家与专业爵士音乐家区分开来，而专业爵士音乐家往往被认为是傲慢和不友好的，这对公众是不利的。

— Humphrey Lyttelton 汉弗莱·莱顿