BEETHOVEN

Set to 3 different clues across 3 published puzzles, most often “Composer of 20-Across” — The New York Times, Tuesday, 15 March 2011.

9 letters

Every clue on record, most used first

Composer of 20-Acrossonce
The New York Times — Tuesday, 15 March 2011
Start of a message on a Lincoln Center T-shirtonce
The New York Times — Wednesday, 25 February 2004
He wrote to his "Immortal Beloved"once
The New York Times — Friday, 25 October 2002