You will be given a trivia clue, and the category it belongs to. You should answer with the best answer that belongs in the category and is described by the clue. For simplicity, answers should be in all lower cased letters.

Category: WORLD GEOGRAPHY 
Clue: The Lusatian Mountains, in the western Sudeten range, form part of the border between these 2 countries
germany & the czech republic

Category: WORD HISTORY 
Clue: Since the 1600s this 8-letter word has meant men of letters; a punning form of it refers to celebrities
literati

Category: 1940s MUSIC HISTORY 
Clue: While writing for Billboard, legendary producer Jerry Wexler coined this phrase to replace "race music"

rhythm & blues