German organist and composer, d. 1750 (4)

I believe the answer is:

bach

(Other definitions for bach that I've seen before include "Affectionate address" , "musical great" , "Brandenburg Concertos composer, d. 1750" , "German composer (affectionate to a Welshman?)" , "Johann Sebastian . . . ., great 18th century German composer" .)

I've seen this clue in The Guardian.

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