You may be asked to prepare a song for an audition. The library has a large collection of song books and librettos.
If you don't read music, you may want to listen to popular and show tunes using the links below.
FreeSound is a database of browsable, downloadable sounds under a Creative Commons License.
Royalty-free sound effects.
The world's largest archive of wildlife sounds.
http://macaulaylibrary.org/terms-of-use
16,000 BBC Sound Effects are made available by the BBC in WAV format to download for personal, educational or research purposes. (Commercial uses require a license.)
SoundBible.com offers free sound clips for download in either wav or mp3 format. The clips on the linked page are royalty-free (please note that clips elsewhere on the site may not be royalty-free).