Johann Sebastian __, composer (4)

I believe the answer is:

bach

(Other definitions for bach that I've seen before include "Name of composing family" , "J. S. -, Ger. composer" , "JS --, baroque composer" , "Johann Sebastian . . . . , great composer (4)" , "Johann Sebastian . . . ., great 18th century German composer" .)

I've seen this clue in The Guardian.

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