Megan's got 47

It is that time of year again. Dance Recital is right around the corner.
Rehearsal is next Wednesday and we should be getting the costume today.
Megan is home with me today so we practiced doing her hair and I decided to have her sing the song they are doing.
This is not a common song that you hear every day but she does sing it more clearly today.
So here it is...what is the song?


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