Chopin, Vivaldi and Scarlatti initially in vogue (3)
I believe the answer is:
fad
'vogue' is the definition.
(I know that fad is a type of fashion)
I don't understand the remainder of the clue.
(Other definitions for fad that I've seen before include "A passing fashion or craze" , "Passing vogue or fashion" , "Passionate interest" , "Affectation" , "Short-lived craze" .)