JSBACH

Set to 5 different clues across 5 published puzzles, most often "St. Matthew Passion" composer, for short — The New York Times, Thursday, 18 November 2010.

6 letters

Every clue on record, most used first

"St. Matthew Passion" composer, for shortonce
The New York Times — Thursday, 18 November 2010
"Original father of harmony," per Beethoven, brieflyonce
The New York Times — Friday, 9 April 2010
Mass producer, for shortonce
The New York Times — Sunday, 14 March 2010
"Goldberg Variations" composer, in briefonce
The New York Times — Wednesday, 21 October 2009
Composer of the "Brandenburg Concertos," in briefonce
The New York Times — Tuesday, 5 June 2007