PianoTrax.com now has an on-line library of 12,000 songs. First: visit the Mp3 Store and see if I have already recorded your song (Classical, Pop, Musical Theatre).
If you can't find the song there Fax me or Email me your sheet music. I will play it into the Piano and send you an Mp3 a little while later. $15 for the first 2 pages and $3 for each additional page.
If you don't have Sheet Music for the song you are singing, I can do a transcription for you. Visit the "Custom Notation" page at PianoTrax.com.
There is also a terrific blog with Top Ten Tips from multiple Industry experts about Auditioning. You'll see tips from a casting director, a music director, a vocal coach, a casting director, etc.
I have accompanied many talented singers including: Cher, Jennifer Lopez, Nathan Lane, Oliviana Newton-John, Rita Moreno, Matt Morrison, Jane Lynch, Loretta Devine, Davis Gaines & Carol Channing.
I have played at the Pantages (Wicked), The Dorothy Chandler Pavillion (The Dead), The Schubert Theatre (Mama Mia), OCPAC (Annie Get Your Gun), The Hollywood Bowl (Camelot) and many more.