Like music with traditional harmony (5)
I believe the answer is:
tonal
'like music with traditional harmony' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for tonal that I've seen before include "Alton (anag.)" , "According to musical key" , "It's wood can be used to make twenty three dn" , "sound character" , "Using conventional keys/harmonies" .)