Composer Joseph who mentored Mozart and Beethoven (5)

I believe the answer is:

haydn

(Other definitions for haydn that I've seen before include "Joseph -, Austr. composer (Farewell Symphony)" , "Composer of over 100 symphonies" , "Barman" , "Esterhazy composer" , "Austrian musician" .)

I've seen this clue in the LA Times.

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