Composer being artistic created harmony initially (4)
I believe the answer is:
bach
'composer' is the definition.
(Bach is an example)
'being artistic created harmony initially' is the wordplay.
'initially' says to take the initial letters.
The initial letters of 'being artistic created harmony' is 'BACH'.
(Other definitions for bach that I've seen before include "Goldberg Variations composer, d. 1750" , "Johann Sebastian . . . . , great composer (4)" , "J. S. -, Ger. composer" , "German composer, who had twenty children, d.1750" , "musician" .)