Auditions for new students should include three contrasting pieces, done solo or within a group. At least two of the pieces must be jazz, and at least one of them should include improvisation. One piece may be classical. Demonstration of technique (scales, arpeggios, etc.) may also be included.
Piano requirements for transfer students can be found on this document: Jazz Piano Transfer Requirements (pdf).
The audio file that corresponds to it is here: There'll Never Be Another You