Too cute!

Last night as I was putting Meredith to bed, we were picking out what she was going to wear to school today. usually we base that choice on the "special" she has that day. So she asked me what she had and I said "You have music tomorrow."
She responded with much drama and enthusiasm,
"THAT'S UNBELIEVABLE!"
And then she paused and asked
"What does unbelievable mean, Mommy?"