List the top 5 genres by number of tracks. List genres name and total tracks.
return tracks  ;return genres of #1 ;return number of  #1 for each #2 ;return the  5 highest of #3 ;return #2 where #3 is equal to any of #4 ;return names of #5 ;return #6 ,  #4
['select', 'project', 'group', 'aggregate', 'comparative', 'project', 'union']