Galaxy S3 suddenly plays only Dewdrops sound for text notifications

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The Messaging app does not appear under Phone Settings > Application manager.
It does appear under Phone Settings > Default applications > Messages. You can only disable/enable it here; there are no other settings.

I have not added or changed any apps for quite some time, well before this sound changed. Since this problem appeared:
I have tried changing to other notification sounds. When I select a sound, it always plays correctly. It has no effect on the actual Messaging notification sound.
I have powered the phone off and back on.
I have removed the battery for several minutes and then reinstalled it.

I happen to like the whistle and it catches my attention. This rogue sound does not. If anyone has a solution or a pointer to one, I'd sure appreciate it.

thanks, bws