The Collaborative International Dictionary of English v.0.48:

Beethoven \Beethoven\ n.
   1. Ludwig van Beethoven, a renowned German composer, born
      1770, died 1827.

   Syn: van Beethoven.
        [WordNet 1.5]

   2. the music of Beethoven. He enjoyed Beethoven most of all.
      [WordNet 1.5]

WordNet (r) 3.0 (2006):

Beethoven
    n 1: German composer of instrumental music (especially symphonic
         and chamber music); continued to compose after he lost his
         hearing (1770-1827) [syn: Beethoven, van Beethoven,
         Ludwig van Beethoven]
    2: the music of Beethoven; "he enjoyed Beethoven most of all"