Hannah has the uncanny ability to learn words to songs after hearing them once or twice. (If she doesn't she makes up her own).
Right now, her favorite song to walk around and sing is Justin Bieber's "Baby Baby". There is a part where they rap in the middle of a verse. She can't keep up with those words, so she just improvises with some "b-b-b-b-b-bam"s here and there.
Here is a sampling of her musical talents:
Look out world, Hannah's gonna rock you out!