The four founders used to hand-pick the students that would go in their houses, but then realised someone else would have to do it after they died, so Gryffindor took off his hat and let it choose, and it worked. Since then, the sorting hat was always used to choose which house the students are put in. Due to its age, it appears "patched and frayed and extremely dirty." Before sorting the students each year, the hat recites a new introductory song. These songs occasionally warn of danger to come, as in Order of the Phoenix. The Sorting Hat's songs vary in length and content, but always include a brief description of each house.
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