The University purchases a Tertiary Music Licence (through ARIA, APRA AMCOS, and PPCA) which allows for certain uses of music for student and staff audiences. This includes live performances at events, background music on campus, and use in teaching. The licence applies to music that is commercially available in Australia (you can search the included repertoire) and has been obtained from a legitimate source, i.e. not illegally downloaded.
For further information, contact the Copyright Librarian with specific details of your proposed use of music. Some circumstances may require university departments to purchase additional licences.