with which musical artist is the producer of the piece maker 3: return of the 50 mc's associated ?
SELECT DISTINCT var_uri where brack_open dbr_The_Piece_Maker_3:_Return_of_the_50_MC's dbo_producer var_x sep_dot var_x dbp_associatedActs var_uri sep_dot var_x a dbo_MusicalArtist brack_close