How many tracks does each genre have and what are the names of the top 5?
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 ,  #3
['select', 'project', 'group', 'aggregate', 'comparative', 'project', 'union']