How would I make a circuit repeat itself?

I want my Big Mouth Billy Bass to play over and over without me pressing it. Is there anything I can do that will make it play over and over until the batteries die? I need to know since I'm doing a project.
Update: How would I bypass the switch? I opened it up and found the switch wires.
Update 2: How would I bypass the switch? I opened it up and found the switch wires.
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