The Old Sorting Hat
The Sorting Hat is the current method of sorting students into their rightful houses. Godric Gryffindor one day though, "How do we sort when we are passed?" He then whipped the Sorting Hat off his head and put a charm on it so that when set upon the students head, the Hat would look for the designated traits and put the students into their house. Every year at the sorting celebration the Sorting Hat sings a different song an if it senses danger coming, if will sing a warning to the school.