Based on the clue 'beethoven wrote a battle symphony celebrating this...', what is the answer?

Based on the clue 'beethoven supposedly said of this works opening th...', what is the answer? Based on the clue 'beethoven tried all the latest scientific methods ...', what is the answer? What is associated with: beethoven was born in 1770 in this city that until 1990 was the capital of west germany? Based on the clue 'beethoven wrote 4 overtures for this opera', what is the answer? Based on the clue 'beethoven wrote a sonata tchaikovsky a symphony w...', what is the answer? Based on the clue 'beethoven wrote but never sent 3 letters addressed...', what is the answer? Based on the clue 'beethoven wrote many solo pieces for this instrume...', what is the answer? Which performer is associated with 'beethoven'?