What are the names of the three artists who have produced the most songs, and how many works did they produce?
return artists ;return songs #1 produced ;return number of  #2 for each #1 ;return #1 where #3 are the   three highest ;return names of #4 ;return songs #4 produced ;return number of  #6 for each #4 ;return #5 ,  #7
['select', 'project', 'group', 'comparative', 'project', 'project', 'group', 'union']