Syncopated music (4)
I believe the answer is:
jazz
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">syncopated music</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for jazz that I've seen before include "Improvised style of music" , "Improvised, syncopated music" , "Form of music" , "Humph's music" , "Cat's music?" .)