Possible Clues:

• Beethoven's Fifth, e.g.: Abbr.
• One of Haydn's 100-plus: Abbr.
• One of Beethoven's nine: Abbr.
• %, for one
• Like a mirror image: Abbr.
• Mozart's "Jupiter," e.g.: Abbr.
• Kin of an abbr.
• Phony introduction?
• Garden spot
• Metric prefix?