Primary Songs vs. Lady Gaga

I heard a funny story today.

There is a girl in our new ward that is from Mom and Dad's ward (Rachael Christensen). We figured out that our parents knew each other last week. This week when I saw her, she said, "Your Rigdon's aunt." I said yes, and she said, " I love Rigdon. I used to help my mom with his primary class and I always sat next to him. We would be singing in primary and I'd lean over to listen to him sing and he's be singing Lady Gaga instead of the primary songs." I've been trying ever since this conversation to figure out which primary song has the same tune as Just Dance.