who is the producer of the song which is the previous work of when the world is running down ?
SELECT DISTINCT var_uri where brack_open dbr_When_the_World_Is_Running_Down,_You_Make_the_Best_of_What's_Still_Around dbo_previousWork var_x sep_dot var_x dbo_producer var_uri sep_dot var_x a dbo_Song brack_close