Please list the model number of your Blackberry and the current OS you are running. Also, if you could give a little more detail of your problem.
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I too am experiencing the same thing, even in the middle of class and even if the all alerts are turned off. Not sure exactly what song it is. I tried a battery pull earlier and it hasnt done it since. Hoping that this has solved it. It happened after hanging up on a call, after receiving a text and so one, although it didnt happen every single time. Hope its gone for good.
I had the same issue but with a different ring/tone that I never had on my phone....Rule #1 backup your device first, then do a battery pull for a complete reboot. It took me about 3 battery pulls and complete reboots for it to dissapear. Hope that helps...It started when I upgraded to 126.96.36.1991 but the reboots solved the issue.
This is one of many known issues with the OS 188.8.131.521 update from Verizon:
-audio clips received through MMS get "stuck" to the end of ringtone alerts, even if they've been deleted. Only known fix is to do a battery pull.