Possible Clues:

• The "J" of J.S. Bach
• One of the Bachs
• "Waltz King" Strauss
• The 'J' in J.S. Bach
• Part of J.S.B.
• Bach patriarch
• One of the Bernoullis
• - - Sebastian Bach
• ''Waltz King'' Strauss
• Either of two Strausses