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The Vienna Boys Choir is singing Mass again at the Chapel of the Imperial Palace every Sunday and religious holiday at 9:25 a.m., beginning on Sept. 14 until the end of June 1981. The choir sings in the loft and cannot be seen, but it certainly can be heard.

And the horse are back. The Spanish Riding School has scheduled performances of the white Lippizaner stallions in the baroque riding hall for Sunday mornings at 10:45 a.m. through the middle of December and Wednesdays evenings at 7 through October.

It's a good idea to arrange for tickets for these events before you leave for your trip; for information go to the nearest Australian National Tourist Office.