My macbook pro makes erratic beeping noises

My macbook pro makes a distinctive, 3 note beeping noise. It repeats at uneven intervals. I went to Console App and saw the following messages repeated at the exact times these beeps happened, so I imagine they are related. I just don't know what these messages mean, nor how to fix them. Can anyone help?
Here are the messages:
8/6/13 8:12:08.420 PM coreaudiod[116]: Disabled automatic stack shots because audio IO is active
8/6/13 8:12:08.594 PM coreaudiod[116]: Enabled automatic stack shots because audio IO is inactive

Reset SMC. http://support.apple.com/kb/HT3964
Choose the method for:
"Resetting SMC on portables with a battery you should not remove on your own".

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