CREATE TABLE table_8584 ("DVD title" TEXT, "Season" TEXT, "Aspect ratio" TEXT, "Episode count" FLOAT, "Time length" TEXT, "Release date" TEXT)

What is the aspect ratio for the September 1, 2009 release?
SELECT "Aspect ratio" FROM table_8584 WHERE "Release date" = 'september 1, 2009'
SELECT "Aspect ratio" FROM "table_8584" WHERE "Release date" = 'september 1, 2009'