If you use avast you will be well aware of the sounds that inform the user of threads and activities.
Whilst the latest standard sounds with the female voice are more soothing than the male voice of early versions, it is a little bland.
if you fancy a little bit of fun with your security notifications have a look at the official avast sounds library New avast! audio notifications available for free download.
Here you can find the official non English versions of the sounds but also a number of more fun versions in the Themes section