Samsung Galaxy Tab A
Find "Settings"
Press Messages.
Press MORE.
Press Settings.
Turn on notifications
Press Notifications.
Press the indicator next to "Notifications" until the function is turned on.
Select message tone
Press Notification sound.
Press the different message tones to listen to them.
Once you've found a message tone you like, press OK.
Return to the home screen
Press the Home key to return to the home screen.